Tips for Narrowing Down Where Voltage Drop Would be on Trailer Wiring

Question:

Ok so I rewire the entire trailer On my 4 pin I have 12 v but it appears that my green pin doesn’t have power the brown does I’ve cleaned to bare metal and the grounds off the lights are solidly connected also At the brown or left I only have 3.26 volts but 12 plus at the truck connector It’s a 2016 ram 1500 I’ve run out of things to check any advise I’m thinking it’s the new trailer harness or a fuse ?

asked by: Louis

Expert Reply:

Start at the front of the trailer where you are getting 12 volts and work your way back to the light assemblies testing as often as possible with a voltmeter like # PT89ZR till you find where the voltage drop and it you should be able to narrow down where exactly the problem is.

expert reply by: Jameson C