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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29427
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a chevy dump truck 2011 my left side turn signals

Customer Question

i have a chevy dump truck 2011 my left side turn signals front and back and brake light not working fuses good bulbs good when i test turn signal wire(yellow) theres no power to back light it can i assume there s a break in that wire to back?
probably caused by dump body going up n down
Submitted: 1 year ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 1 year ago.

Hi there, I am Cam. Can You tell me what series this is? 3500? 4500?

Customer: replied 1 year ago.
3500
Customer: replied 1 year ago.
dump truck
Customer: replied 1 year ago.
both dump body brake and truck stop lamp and turn signal not working i tested wires yellow wire when i have left turn signal on has no power to it
Expert:  GM Tech (Cam) replied 1 year ago.

OK, I am not thinking yet that there is a broken wire but I don't want to dismiss this as the front signal light should work still. There is a fuse to supply just that side, it’s the LT TRN STOP fuse in the left dash fuse block. Can you start by checking that fuse?

IF there is a fuse popped then its possible we have a short in the wiring that moves with the dump box.

Customer: replied 1 year ago.
fuse good with left turn signal on fuse blinks both sides but real fast
Customer: replied 1 year ago.
im guessing under dump wire to yellow wire broken or shorting out becase at light no power to yellow wire
Customer: replied 1 year ago.
no power to yellow wire to at tail lamp
Customer: replied 1 year ago.
i had throat cancer so talking one on one hard as i have trouble with speech
Customer: replied 1 year ago.
u there
Expert:  GM Tech (Cam) replied 1 year ago.

Yes I am , just getting my kids up.

Expert:  GM Tech (Cam) replied 1 year ago.

This system uses the Body Control Module (BCM) under the dash to control the lights directly so I am thinking that either that fuse is not getting power, one other fuse is not getting power or that Body Control Module (BCM) is bad. Again for both front and back to go out suggests it’s not the wire to the back.

Expert:  GM Tech (Cam) replied 1 year ago.

I have to restart my computer, be right back.

Customer: replied 1 year ago.
even if wire short in back? grounding out
Expert:  GM Tech (Cam) replied 1 year ago.

It would or should still pop that fuse. You checked all the fuses? Given this is a computerized system, some other fuses for the BCM could be bad, they are TBC fuses in the left dash and under hood fuse block.

Customer: replied 1 year ago.
checked fuses under hood and in instrument panel circut test fine
when circut test fuse under hood with tester light it flashes fast like a bulb is out is there another fuse other then left turn signal/brake like i should be looking for. and if bcm no good wouldnt left and right turn signals be out
Expert:  GM Tech (Cam) replied 1 year ago.

If the Body Control Module (BCM) failed, it would only take out the side that is bad. Attached are the schematics for your 2011 turn signals.

Expert:  GM Tech (Cam) replied 1 year ago.

Also attached is the document to diagnose this issue.

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