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10-16-2013, 11:05 PM | #1 |
Carpe manana
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How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip??
I've got the 99 Suburban and an extra battery. The Sub came with an aux (LH) battery tray and I see attached to the under hood fuse block there are two battery terminals labeled "Aux A" and "Aux B". How do I wire up the aux battery without ruining the wiring?
My hope is that by doing so I have one battery dedicated to starting the Sub while the other can run equipment when the engine is off and drain with no consequence for starting. I've installed OEM aux battery setups in my 1972 Blazer and K20 - just not at all familiar with newer model trucks and couldn't find a related thread. Thanks, Pete
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
10-17-2013, 12:04 PM | #2 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
I did this many years ago with my '89 K1500. It's been so long that I doubt the factory parts are still available. There was a wiring harness and relay that mounted next to the windshield washer jar on the driver's side fender. I had to open up a hole on the firewall to connect part of the harness to the fusebox. It was all done with factory parts in the factory routing locations. It was kind of tricky since the diagram is not in the same orientation as the fusebox. It works great and the battery stays charged. I'd provide pictures except for the fact that my truck is getting some paint these past couple of weeks.
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
10-17-2013, 12:49 PM | #3 | |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Quote:
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
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10-17-2013, 05:51 PM | #4 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
It's actually for the camper package. The diesel trucks also had an aux. batt. for other reasons, I think. There's an extra 10 ga. lead that goes from the aux. batt. to the terminal under the plastic cover on the pass. side firewall.
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
10-17-2013, 06:13 PM | #5 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Aux A & Aux B are NOT for connecting the battery. Those posts are there for things that you might ADD. There is a factory option or two that use them, I can't remember what right now. Camper/Trailer wiring is the most commonly added feature.
Give me a few minutes and I think I can have your wiring diagram. Help me out here, 350/454, 1500/2500?
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
10-17-2013, 08:28 PM | #6 | |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Quote:
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
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10-19-2013, 09:38 AM | #7 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
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10-19-2013, 09:45 AM | #8 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
General 88-98 info
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10-19-2013, 09:49 AM | #9 |
Carpe manana
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Huge help - thank you!!
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
10-19-2013, 09:56 AM | #10 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
No problem. ....That's the best could do. I have never been under the hood on a 96-99 suburban. If you need any more info, just let me know what you need and i will try and look it up.
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10-19-2013, 10:04 AM | #11 |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Will do! That gives me a lot to go on. If a member has this setup already in use some pics would be great. Thanks again, Pete
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
10-19-2013, 11:17 AM | #12 |
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Location: Yucaipa, Calif.
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
You may find this wiring diagram helpful. This is what I used when I wired my aux battery in my truck. The tricky thing about this diagram is that the convenience center is in a different orientation on the truck than it is in the diagram. It caused me to pause a bit when I was wiring up the battery. I had the advantage of using the factory harness which might not be available any more.
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
10-19-2013, 11:35 AM | #13 | |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Quote:
__________________
1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
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10-19-2013, 01:19 PM | #14 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Mr_Rich, What's the name of that book. I need to get that one.
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10-19-2013, 04:14 PM | #15 |
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Location: Kernersville, NC
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
I added a second battery to my 99 K3500. But I just wired mine in parallel. There's a heavy gauge wire that comes from the passenger side battery, traveling on top of the radiator shroud to the driver's side, turns by the washer fluid reservoir neck, and goes to the under hood fuse box. For lack of the proper term, I'll call it the feed wire.
I installed my driver side battery, and cut the feed wire where it could connect to the positive terminal on the driver side battery, and put a terminal on it to fit under a side terminal connector. Then I replaced the amount of wire I'd cut out with the largest diameter wire I could fit in the original location, I think I used 4 gauge. I grounded the driver's side battery on one of the bolts that holds the A/C compressor on. I verified that it was a good connection by starting the truck a few times with just that ground wire connected. So the passenger battery uses OEM wiring, and the driver's side battery has a heavy gauge wire going post-to-post, and the OEM wire feeding power to the under hood fuse box. I did this in January of 2004, and never had a problem with it. Granted, this is parallel wiring. If you wanted to isolate them, it gets more complicated. |
10-19-2013, 04:43 PM | #16 | |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Quote:
st-375-89 edd
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
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10-19-2013, 06:08 PM | #17 | |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Quote:
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
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10-19-2013, 07:24 PM | #18 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
I have factory installed auxiliary batteries on my 99 Cop Tahoes and can take some pics and post them on here if you think they will help. It'll be a day or two until I can get to the garage where they are stored to take the pictures.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
10-19-2013, 07:30 PM | #19 |
Carpe manana
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Greg - I greatly appreciate that! No rush. Thanks, Pete
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
10-19-2013, 07:36 PM | #20 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
10-4, anything particular you need to see?
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
10-19-2013, 07:40 PM | #21 |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Sorry for the delay, computer wasn't cooperating. Here is what I can provide. Also threw in the DUAL battery wiring, so you can see how it differs. Quite a bit really, they're just in parallel on dual battery vehicles.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
10-19-2013, 07:53 PM | #22 |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Pos lead from aux battery to wherever it goes (J-block) and that lead followed back if poss. Thx!
Thx!! Will review...
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
10-19-2013, 09:17 PM | #23 | |
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Quote:
#1 - 15354169 - Cable, Aux Bat Pos #2 - 12338130 - Nut, Hex 5/16-18X.25 286M POR #3 - 19115561 - Bolt, Hex Hd, 3/8-16X13/32, 1/4 THD, 1 5/32 TOTAL LG, 51/64 OD #4 - 00136857 - Washer, External Tooth LK 7/16 #5 - 12190685 - Cable, Aux Bat Neg #6 - Same as #4 #7 - Same as #3 #8 - 12135196 - Relay, Aux Bat #9 - 12160765 - Cover, Bat Pos Cbl J/Blk #10 - See below... #11 - 15551605 - Bolt, Hwh Tap, M6.3x1.27x20, 18.5OD, TR PT1018, AL #12 - 11516079 - Nut, Prevailing Torque Type W/WA Insert (M6x1 THD8.8 THK) #13 - 88862249 - Connector, Pwr Dist Blk (ACDelco #PT2330) #10 is a pistol, it's the cable that connects the relay to the battery. It is very RPO dependant, depending on what options you have this cable varies in length and gauge.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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10-20-2013, 10:20 AM | #24 |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
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Re: How do I correctly wire an auxiliary battery 99 Suburban using existing GM equip?
Devin - much appreciated! I'll work on tracking down the components and get #10 squared away. I may hit some local salvage yards on the off chance that a Sub is sitting with all the pieces intact. My Sub came with a 100 amp alternator - imagine I'll need to bump that up to 140 once I get both batteries installed.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland |
10-20-2013, 10:41 AM | #25 | |
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Quote:
Personally I consider the extra battery to act a "buffer" for heavy electrical loads. It allows to alternator to work moderately for a longer duration to recharge the batteries, rather than working to it's limits for a short duration. |
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