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Have a 2005 GMC G31, which is basically a Chevy express

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have a 2005 GMC G31...
have a 2005 GMC G31 , which is basically a Chevy express 3500 , converted to a dually box truck. im having problems with my power wire to my taillights, my brake lights/turn signals work, but no power at taillight wire. checked all fuses / relays, tried to replace headlight switch. still nothing,is there a wiring digram for this box truck so i could check for a faulty ground
Submitted: 4 months ago.Category: Chevy
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Answered in 9 minutes by:
3/18/2018
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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Yes, I can get that for you. You should have power on the brown wire to all of the tail lamp circuits, including the plate lights. Do any of them work back there at all?

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Customer reply replied 4 months ago
no i do not have power to anything back here at all, i have power at lr park and rr park fuse under driver seat
Customer reply replied 4 months ago
how do i know if i have good ground to tailight running light power wire
Customer reply replied 4 months ago
can you attatch schematics for the box truck version?
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

It's the same schematic, the box doesn't come from GM, so there isn't a GM schematic for it. Typically, the box doesn't have the lights on it anyway, but even if they do, the box installer generally keeps the same wire colors and all of that, so it should be consistent.

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Customer reply replied 4 months ago
where does the wire go to from lR park fuse and RR prk fuse
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

They go to the arrows marked C and D in the next image, that's why I attached both images.

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Customer reply replied 4 months ago
the brown wire goes directly to the fuse box under the hood?
Customer reply replied 4 months ago
im sorry, directly to fuse box in body
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

Well, depends on how you look at it. Power flows from top to bottom in most schematics, this one included. Power originates at the fuse box and goes out to the brown wires and the rear lights.

If you're looking at it from the taillights forward, yes, the brown wire goes from the tail light to the fuse box.

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Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

Did you get this worked out?

Please take a moment to rate my answers using the stars at the top of the page, that's how I get compensated. Let me know if you need anything else, I am happy to follow up.

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Customer reply replied 4 months ago
no i have not gotten it worked out yet
Chevy Mechanic: Jerry Newton, Chevy Technician replied 4 months ago

OK, just wanted to follow up with you. Let me know if you need anything else on this.

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