help with an 04 chevy duramax
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=40477
Printed Date: May 10, 2025 at 2:06 AM
Topic: help with an 04 chevy duramax
Posted By: claytargethntr
Subject: help with an 04 chevy duramax
Date Posted: October 07, 2004 at 7:02 PM
I was helping a friend wire in some undercarrage lights on his new chevy (I have done this on my superduty with no problems). The overall schem was two lights mounted under the truck, power for the lights is from the power distrubution under the hood (big box on the left side under the hood) basicly from the battery. we tied in a relay that is activated by a tap into the grey/black wire in the A pillar that goes up to the dome light.
We get it all hooked up, go to test it and nothing, no dome light either. BUT the door lights still work. Checked every fuse, checked continuity on the wire to the dome light (grey/black). I am lost as to what has happened in this truck. we disconected all that we did and still nothing. I have done a fair amount of wiring before and this just does not make sense. Please help
Replies:
Posted By: mo12v
Date Posted: October 07, 2004 at 7:29 PM
How did U wire the Relay Pins
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MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: claytargethntr
Date Posted: October 07, 2004 at 7:47 PM
30 powered from battery
87 out to the undercarrage lights
85 triggered from dome light
86 ground
claytargethntr
Posted By: mo12v
Date Posted: October 07, 2004 at 7:57 PM
Relay wiring should have worked.............I'm sure there is NO bare wires anywhere......? ! ? !
Do U still have power to Power Distribution Box?
I think there is a couple of Fuse-able Links in the Main Battery wires and did U check the BIG fuses? ------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: claytargethntr
Date Posted: October 07, 2004 at 9:13 PM
yeah we checked for no bare wires, we looked at the fusable links. plus EVERYTHING but the dome light works in the truck. the door lights, the other overhead lights. truck runs. just the domelight died. does this have a gem module that monitors the interior lights could there be a problem there?
this one has me baffled
claytargethntr
Posted By: draasch
Date Posted: October 07, 2004 at 9:22 PM
whay are you tapping into the domelight wire?????
are you putting in running lights???? ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: mo12v
Date Posted: October 07, 2004 at 9:24 PM
Dome lite passes thru BCM
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MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: claytargethntr
Date Posted: October 07, 2004 at 11:57 PM
draasch
we mounted lights under the truck, the goal is to have them come on whenever the dome light is on. They light up where you will step out of the vehicle. Avoid snakes, mud puddles ect. I wired a set into my ford last year and they have been great. This buddy wanted the same thing.
mo12v
I am not a chevy guy, Could the BCM be the problem What else would be affected? I imagine that is what ford calls the GEM. Thanks for all your help
claytargethntr
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