wiring help please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

#169fan · 12-29-2009, 06:37 PM

I am converting my 69 GMC to an HEI ignition. can anyone point me in the right direction to find some wiring diagrams on this conversion/ I have been looking through this site and I am having trouble finding anything that discusses how to hook the HEI up so I can start it with no body on the truck yet. I will temporarily wire up an ignition switch I am just not sure how to hook the starter and distributer and everything up. I can do just about everything mechanically, but i lack in the wiring department. I will post a few pics of what I have done so far. This has been a complete restoration from the ground up.

OhOneWS6 · 12-29-2009, 06:39 PM

HEI is easy. All you need is 12v to the "Batt" terminal on the cap.

The info you need for starter circuit is in here.
http://www.hotrodders.com/forum/push...ch-142866.html

71meangreenc10 · 12-29-2009, 06:42 PM

I always run a heavy guage wire through the firewall from the HEI to the fuseblock, there is a plug that is open that you can use. Can post a pic if you like. Just make sure its 12volt with the key on only.

Some places sell factory wiring harness's that have the HEI wire made into it. Thats what i bought for my shortbed truck.

Smitty

#169fan · 12-29-2009, 06:49 PM

Here are a few more pics. I took it all the way apart! not a single nut, bolt or rivet was left unremoved! Front end and rearend were removed and replaced with a 5 bolt from a newer donor truck. frame was sandblasted and coated with Herculiner which turned out amazing. I am ready to start on the body now! frame and driveline are done. I just need to start trhe motor and get it broke in. It may be a bit before the body work is done, so i just want to be able to start the motor ocassionally while I am waiting on the body!

71meangreenc10 · 12-29-2009, 06:56 PM

Thats what I did with my shortbed, all the way down to the frame....It was worth it. Just be patient putting it back together....If you want it to look factory, I would get the harness with the HEI wire put into it. it looks good.

Bill Athey got me mine, hes on the board, or google atheys truck parts.....

Smitty

OhOneWS6 · 12-29-2009, 07:11 PM

Looks good. As a temporary way to start it you can wire in an ignition switch or you can get a toggle switch and a momentary switch. For the HEI you need + 12VDC through a toggle switch and then to the "Batt" terminal on the cap. For the starter you need a + battery cable to the starter and + 12VDC through a momentary switch back the the "s" terminal on the starter. Turn the toggle on for the HEI and hit the momentary switch for the starter. You can get the + 12VDC for both switches either from the battery or from the large terminal on the starter. I suggest the battery just because it is easier to get to. You will also need a negative cable from he battery to the engine block.

low79fx · 12-29-2009, 09:40 PM

Try this one.Its for 60-66 GMC but I went with HEI ign.which is basically the same at the engine.
http://67-72chevytrucks.com/vboard/s...d.php?t=378484

12-29-2009, 06:39 PM	#2
OhOneWS6 Registered User Join Date: Dec 2009 Location: DFW, TX Posts: 764	Re: wiring help please HEI is easy. All you need is 12v to the "Batt" terminal on the cap. The info you need for starter circuit is in here. http://www.hotrodders.com/forum/push...ch-142866.html __________________ 72 Cheyenne Super 1/2 LWB White/Dark Yellow 07 Avalanche 2LT 74 Sleek Craft Rebel Jet Boat W/Pontiac 400 Last edited by OhOneWS6; 12-29-2009 at 06:44 PM.

12-29-2009, 06:42 PM	#3
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Re: wiring help please I always run a heavy guage wire through the firewall from the HEI to the fuseblock, there is a plug that is open that you can use. Can post a pic if you like. Just make sure its 12volt with the key on only. Some places sell factory wiring harness's that have the HEI wire made into it. Thats what i bought for my shortbed truck. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

12-29-2009, 06:49 PM	#4
#169fan Registered User Join Date: May 2008 Location: Lamar Missouri Posts: 36	Re: wiring help please Here are a few more pics. I took it all the way apart! not a single nut, bolt or rivet was left unremoved! Front end and rearend were removed and replaced with a 5 bolt from a newer donor truck. frame was sandblasted and coated with Herculiner which turned out amazing. I am ready to start on the body now! frame and driveline are done. I just need to start trhe motor and get it broke in. It may be a bit before the body work is done, so i just want to be able to start the motor ocassionally while I am waiting on the body! Attached Images

12-29-2009, 06:56 PM	#5
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Re: wiring help please Thats what I did with my shortbed, all the way down to the frame....It was worth it. Just be patient putting it back together....If you want it to look factory, I would get the harness with the HEI wire put into it. it looks good. Bill Athey got me mine, hes on the board, or google atheys truck parts..... Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

12-29-2009, 07:11 PM	#6
OhOneWS6 Registered User Join Date: Dec 2009 Location: DFW, TX Posts: 764	Re: wiring help please Looks good. As a temporary way to start it you can wire in an ignition switch or you can get a toggle switch and a momentary switch. For the HEI you need + 12VDC through a toggle switch and then to the "Batt" terminal on the cap. For the starter you need a + battery cable to the starter and + 12VDC through a momentary switch back the the "s" terminal on the starter. Turn the toggle on for the HEI and hit the momentary switch for the starter. You can get the + 12VDC for both switches either from the battery or from the large terminal on the starter. I suggest the battery just because it is easier to get to. You will also need a negative cable from he battery to the engine block. __________________ 72 Cheyenne Super 1/2 LWB White/Dark Yellow 07 Avalanche 2LT 74 Sleek Craft Rebel Jet Boat W/Pontiac 400 Last edited by OhOneWS6; 12-29-2009 at 07:12 PM.

12-29-2009, 06:37 PM	#1
#169fan Registered User Join Date: May 2008 Location: Lamar Missouri Posts: 36	wiring help please I am converting my 69 GMC to an HEI ignition. can anyone point me in the right direction to find some wiring diagrams on this conversion/ I have been looking through this site and I am having trouble finding anything that discusses how to hook the HEI up so I can start it with no body on the truck yet. I will temporarily wire up an ignition switch I am just not sure how to hook the starter and distributer and everything up. I can do just about everything mechanically, but i lack in the wiring department. I will post a few pics of what I have done so far. This has been a complete restoration from the ground up. Attached Images

12-29-2009, 09:40 PM	#7
low79fx Registered User Join Date: Jun 2008 Location: odessa,tx Posts: 208	Re: wiring help please Try this one.Its for 60-66 GMC but I went with HEI ign.which is basically the same at the engine. http://67-72chevytrucks.com/vboard/s...d.php?t=378484



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