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Trailer Backup Light
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   Fishing Boats, Motors, Trailering, Q & A or Discussion

Posted by drdetroit
8/9/2020 4:15 PM

Trailer back up light

My port side trailer backup light went out last week. I assumed it was the LED light! I ordered a new one plug
it up and nothing! Check the voltage and continuity they are perfect all the way back to the plug! The new and old LED lights work on the starboard side of the trailer. I cleaned and checked the ground wire for the light still no backup light on port side! Any suggestions??
 Dr Detroit 
Posted by flyman
8/9/2020 7:17 PM
As Dean he helped me with mine...
Posted by drdetroit
8/9/2020 9:00 PM
Dean cannot figure it out!
Posted by flyman
8/9/2020 9:28 PM
I wish I could help, but Dean would agree I don’t know what I’m doing....
Posted by Smalliefan2
8/9/2020 10:53 PM
Yea, did continuity test on both sides. Circuit good to the truck. Plugged "bad " light into working side, it lit up, so light is good. Mike cleaned the ground. I am baffled, only guess is a bad plug, though it worked doing continuity test. Those are all the easy things to check. Still scratching my head where the problem is.
Posted by fischnrod
8/10/2020 7:00 AM
When you say continuity did you check to see if it had power to that light when your tow vehicle is in reverse or just to see if a wire was broke ?
Posted by Smalliefan2
8/10/2020 10:50 AM
Just checked to see if the wire was broke. Probably should check with power, that may be the answer. Thanks
Posted by Gator
8/10/2020 5:37 PM
Check your fuses on the tow vehicle.

Edited by Gator 8/10/2020 5:37 PM
Posted by fischnrod
8/11/2020 7:26 PM
Did you get it fixed, Inquiring minds want to know
Posted by jcodylew
8/12/2020 6:21 AM
I would definitely check the voltage where the light plugs in... OR id ohm out the wire to the ground circuit/trailer... the wire may be "in tact" so it will buzz out good, but if there is some broken insulation somewhere it may be grounding itself out.

Edited by jcodylew 8/12/2020 6:22 AM
Posted by drdetroit
8/12/2020 7:09 AM
When they wired my trailer they needed to have power for the brake solenoid so you guessed it they tied into my left backup light! The solenoid shorted out and killed the backup light! We cut out the wire to the solenoid and joined the wires together for the backup light and I now have two working lights!
Now I have to replace the brake solenoid!
Posted by jcodylew
8/12/2020 2:57 PM
the saga continues!! good luck
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