Where can I find a parking light wire to tap into?

[Morgan McGinnis]

I have a 21 silverado 1500 custom that I put roof lights on, I need to find a wire that I can put a T tap on to make them work. I want them to function like a factory light, on with headlights, parking lights, and when you press the fob. Is there a wire in the BCM or in that area I can tap to? Any help appreciated!

[asilverblazer]

Depends on where you want to tap into a wire at. Presumably near the switch?

 

gmupfitter has wiring diagrams...

[silveradosid]

the bcm sends a ground signal to the park relay in the under hood fuse panel. you could use an ignition powered supply for the light and use the ground from the bcm to ground your roof lights

[Morgan McGinnis]

On 2/3/2024 at 7:20 AM, silveradosid said:

the bcm sends a ground signal to the park relay in the under hood fuse panel. you could use an ignition powered supply for the light and use the ground from the bcm to ground your roof lights

I grounded them to the chassis I just need a marker lamp wire somewhere near the bcm to tap in and power them. Tried an add a circuit in the main fuse box, kept blowing fuses for parking lamp B.

[LowUfo]

I used a mini fuse tap and connected it to the parking light fuse under the hood.  Works perfect for cab clearance lights I installed

 

 

[RedLT]

On 2/12/2024 at 12:40 PM, Morgan McGinnis said:

I grounded them to the chassis I just need a marker lamp wire somewhere near the bcm to tap in and power them. Tried an add a circuit in the main fuse box, kept blowing fuses for parking lamp B.

 

I would recommend running that add a circuit to a relay as a trigger source and using the relay to power your roof lights. It's probably blowing because it's pulling too much volts, the relay will solve that issue.