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07-20-2021, 10:38 PM | #1 |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,299
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Need a hot for roof marker lamps - will this work?
I’ve got all the pieces I need to install optional GM roof marker lamps in my 99 suburban. For this year, the dash harness connection is supposedly buried deep inside the dash. I’ve not been able to confirm where it’s located.
Therefore I’m contemplating a “plan B” for powering the lamp harness and am wondering if the following idea is reasonable. I’d like to splice the harness hot wire (brown?) with a supply wire at the headlight switch. Seem reasonable if I can identify which wire is hot when the running lights are on?
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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 |
07-21-2021, 01:17 AM | #2 |
Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,710
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Re: Need a hot for roof marker lamps - will this work?
Tapping the running light circuit seems logical. Add up wattage of all roof marker bulbs. Watts/volts=amps. If worried about added load just put roof markers on a relay and power the relay with the running light circuit. Tapping at the marker may prove easier if you do not want to trace the circuit.
Edit- You may be able to put your HL switch in the park lamp position and check for continuity between red wire and others. That should show which wire is hot for the park/running light circuit.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 07-21-2021 at 01:41 AM. |
07-21-2021, 07:40 AM | #3 |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,299
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Re: Need a hot for roof marker lamps - will this work?
Thanks for the reply. I appreciate the advice. The bulbs are style 194 3.78 Watts 0.27 amps total five bulbs. I could substitute LED bulbs for the incandescent examples now in hand.
I’ve located a helpful schematic for the switch that indicates the brown wire is that for the parking lights. So, it looks like a brown to brown wire splice would be the way to go and ground out the black harness wire. I’ll still hunt for the appropriate harness connector and splice as a last resort.
__________________
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 Last edited by DeadheadNM; 07-21-2021 at 07:41 AM. Reason: Added |
07-23-2021, 02:09 AM | #4 |
Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,710
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Re: Need a hot for roof marker lamps - will this work?
About 1.5 amps total for the load. I would not worry about adding the lights to the circuit. Good luck finding the connector. I would be looking for it myself as well, just in case it is there.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
07-23-2021, 07:46 AM | #5 |
Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,299
|
Re: Need a hot for roof marker lamps - will this work?
Great. Thanks again. I’ll post back when I complete the project.
__________________
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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