Working on installing a back up camera.

Camera is working perfect, turns on and head unit switches to camera view when ZF6 is put into reverse, closing the backup light switch

Issue is both backup lights aren't working anymore. They were, but have since stopped. Tail lights also don't appear to be turning on when I pull the plunger light switch? Or they are coming on very dimly? Also the license plate light isn't lighting up either with the plunger light switch pulled out.
headlights operate normally with plunger light switch pulled out. Side market lights were illuminating correctly when put into reverse.

Camera was wired in parallel with one of the back up lights. Green hot of back up light wired to hot power for camera, as well as hot power signal that goes to head unit to switch view feed to camera. Ground black of back up light wired to ground of camera.

I disconnected all that though and the backup lights are still not turning one when put into reverse.

Using a multi meter, measuring at the bulb socket, I am showing a short between the black and green wire, 0.5 ohms

Both bulb sockets show this. This is with tail light harness pictured completely disconnected, the harness that feeds out of the cabin near the passenger tail light.

Both back up lights were turning on correctly prior to the head unit install. Not sure if this is related?
Only suspect there is the brown light switch control wire that I connected to the head unit to "tell" the head unit the plunger light switch was pulled out..

I am confused and at a loss

Any tips?

 

Got it!

There was a ground that wasn't bolted down

Still confused as to why that bulb socket reads shorted between the two leads...

 

When you measured across the green and black wire of the socket did you remove all four bulbs? If just one bulb was left in you would read low impedance. as you are reading the filament of the bulb.