Back up lights CSA

Try to switch between the gears, if they light don't work, or if there box need a adjustment.
I accept, you check as first the bulb?
Often at those old lights there other ground has contact issues

Breiti
 
There should be B+ at the switch at the transmission all the time.
Selector ground is for starter relay
 
Battery positive.

Check for battery positive at the wires at switch- one should be “hot”

Jumper the 2 wires at the switch to see if switch is bad next.
 
Power was there, so I back to the rear lights. They were loos and had some corrosion.
I also found a leak at the transmission. Not sure where its coming from. Its a Borgwarner...
Thanks for your help!
 
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