How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
Type Your Chevy Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

Reverse light do not work on 2015 3500 HD .fuses under hood

Customer Question

reverse light do not work on 2015 3500 HD .fuses under hood are good but there is no power on either aide of fuse.
JA: Sometimes things that you think will be really complicated end up being easy to fix with a Chevy. The Chevy Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: back up lights do not work. there is no power at the fuses under hood and the fuses are both good.
JA: Are you hoping to fix this yourself?
Customer: yes it seems like it should be simple,
JA: Great! What have you tried so far?
Customer: checked under hood fuses, and checked all fuses on both sides of dash. the problem happened while wiring new lights. this is a cab and chassis truck.
JA: Is there anything else the Chevy Mechanic should be aware of about your Chevy?
Customer: brand new truck, while wiring new lights accidentally touched a hot wire to ground. all other lights work fine.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Chevy Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Chevy
Expert:  Dave Nova replied 1 year ago.
Which engine and transmission do you have in your 3500 HD ?
Customer: replied 1 year ago.
Duramax Allison trans
Expert:  Dave Nova replied 1 year ago.
Does shift indicator on dash show R when in reverse?
Customer: replied 1 year ago.
Expert:  Dave Nova replied 1 year ago.
Do you know which lighting circuit you shorted prior to this happening?
Customer: replied 1 year ago.
Had to be reverse light. everything else works
Expert:  Dave Nova replied 1 year ago.
Check voltage at VEH BACKUP and TRLR BACKUP fuses in the underhood fuse panel. Make sure engine is running and transmission is in reverse. This will of course require an assistant to hold the brakes for you.
Customer: replied 1 year ago.
will try this tomorrow, but if there is no power there how could there be voltage?
Expert:  Dave Nova replied 1 year ago.
There is a relay that supplies power to these fuses, but will only energize with engine running and transmission in reverse. Otherwise there is no power (voltage) at these fuses.
Customer: replied 1 year ago.
where is that relay?
Expert:  Dave Nova replied 1 year ago.
This relay is built into the underhood fuse panel. It is not accessible, or serviceable.