No reverse lights

I have an 06 Denali Envoy and no power for reverse lights. Fuses are good switch at transmission is okay bulbs and sockets are good
 

Maverick6587

Well-Known Member
Are you getting power to the connector that plugs into the tail light circuit board?
 

Redbeard

Well-Known Member
Suggest using a trouble shooting light and not just a Voltage meter. Years ago a circuit I was having problems with showed 12 volts, but yet no light would illuminate. Thankfully one wiser/older gentlemen saw what I was doing and mentioned that "maybe not enough current" was getting to light the bulb and use the test light instead. Lo and behold he was right. And maybe to add to that thought for today I wouldn't suggest using a LED test light either. I have seen some LED bulbs illuminate with nearly zero voltage. It might be picking up stray voltage from poor grounds or something, but for me use a trouble shooting light with the old filament bulb inside. Plus the
incandescent doesn't care which end is positive or negative (and an led bulb would be).
 

Maverick6587

Well-Known Member
I suggest following Redbeard's instructions then. I agree with him about the use of an incandescent bulb.
 

TollKeeper

Well-Known Member
If I remember correctly, isnt there a reverse light wire in the trailer hitch plug? If there is, see if its getting power. Its on a different fuse (IIRC).
 
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Murray Hooey

Member
If I remember correctly, isnt there a reverse light wire in the trailer hitch plug? If there is, see if its getting power. Its on a different fuse (IIRC).
Okay will check as that not fuse 32 rear fuse box as it has power

I don’t have access to multimeter at moment but backup trailer light fuse so good.
 
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Murray Hooey

Member
If I remember correctly, isnt there a reverse light wire in the trailer hitch plug? If there is, see if its getting power. Its on a different fuse (IIRC).
If I tow trailer is has reverse. Does an 06 Denali have front reverse lights? I haven’t looked and made sure it has incandescent bulbs back one do.
 

TollKeeper

Well-Known Member
Not sure to be honest.. I know some had a reverse wire in the rear plug, and some didnt (My Tahoe Did, my XUV does). But the point I am making is that you need to set the parking brake, turn the ignition on, but not started, and put the truck in reverse. Then test that wire at the rear trailer harness. If that wire has power, that means the neutral safety switch is working, at least thats the way I understand it.
 

Mounce

Well-Known Member
Test at socket for power, test at socket for ground. Find what you're missing. Best way to test a circuit is loaded, ie: bulb installed, or at the very least an incandescent test light as mentioned, but even then that might not provide enough load to show the issue. But to test it loaded with the bulb would require probing the wire unless it has a removable socket in which you could back probe with a T-pin.

Once you find what you're missing, back track from there.
 

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