A few days ago I went to put the truck in reverse to turn around and I noticed my backup lights didnt come on. Tried replacing the bulbs and it didnt work the break lights and all that come on so what could it be? Thanks

89' pickup 4 inch rough country suspension 31x10.50 dick cepek fc2s 15x8 ion alloy 174 series wheels+ glenns over the rail dogbox,mega 4 tracking unit,cb and private band radio, 2 6x9 speakers and over 15 deer a year put on the back!

 

I doubt it's a fuse since you say everything else is working fine. But what all goes through that circuit?

Bad ground?

Did someone hack into the wiring to run trailer lights?

Another thing to look for is butt connectors.
When people who don't really know what they're doing work on electrical systems they generally use cheap crimp butt connectors with no shrink tubing. Those connections are trouble waiting to happen in the form of corrosion or a loose connection.
I've seen so much of peoples hack/garbage electrical work on vehicles that I just expect to go back through it when I see any electrical mods.

 

+1 on NOT the fuse.
Backup light takes power from engine fuse. IF engine fuse is out, you would have charging issue for sure, no power to ECU for sure, and turn signals (I think).

+1 on hack jobs as suspect, cheap trailer light install and butt-connectors, etc...

Check ground on backup light socket.
Check for 12V on backup light socket when in reverse.
Check for 12V on on of the terminals on back-up switch connector on left side of tranny. If not 12Volts at all, trace circuit to engine fuse.

Remove connector from back-up switch on tranny, check if contacts close when placed in reverse.

 

I would check the switch first .

Then the connection at the plug for the switch.

Have your back up lights ever worked??

Corroded sockets can also cause them to not work.

wrong bulbs??

 

I would also check the wire harness right around the passenger rear shock mount I have found on both of my toyota's the wires were broken or corroded in this area.

 

Yes they have worked til recently and it was hacked about 15 years ago to put trailer lights ill check the switch and stuff that's what I was thinking but I didn't know if there was something that had just come loose or something

89' pickup 4 inch rough country suspension 31x10.50 dick cepek fc2s 15x8 ion alloy 174 series wheels+ glenns over the rail dogbox,mega 4 tracking unit,cb and private band radio, 2 6x9 speakers and over 15 deer a year put on the back!

 

There you go. The way trailer adapters are installed are often to blame.

Awesome! Yota put to good use!

 

It was the ground being loose I guess I hit a bump I didn't see real hard and a whole bunch of things that I never even knew I had started working lol and oh yeah the yota stays in the meat!

89' pickup 4 inch rough country suspension 31x10.50 dick cepek fc2s 15x8 ion alloy 174 series wheels+ glenns over the rail dogbox,mega 4 tracking unit,cb and private band radio, 2 6x9 speakers and over 15 deer a year put on the back!