Gound fault or shorted lamp/socket, both involving the tailight circuit
on the trailer.
JR

wrote:
Hello.

Talking bout a 1994 Ranger 4Cyl.. purchased a T connector wiring
harness for 4 wire trailer with included tail light converter. Also
purchased the circuit tester that plugs right in to it (with lights to
test the tail, left, and right blinkers.)

Heres what happens to the tester

With my truck headlights off, I can step on the brake, and both blinker
lights light up (expected,)
and each blinker will blink properly.

Now, as soon as I turn the taillights on:

The "TAIL" LED Lights right up.. but if i step on the brake pedal OR
turn either blinker on, none of the blinker lights light up on the
tester.

This is where it gets good:

IF I plug my trailer in and turn my trucks headlights on and turn the
right blinker on, my left REVERSE LIGHT will blink. Left blinker and
the right reverse light lights.

I should also add that i have a tow connection in the front of my truck
( I assume it was, at one point, pulled by an RV by a previous owner
and he/she used this connection to work the lights.) It is a 6 or 7 pin
round connection (Just over an inch in diameter.)

My question is.. whats up with this? Could the front trailer wiring
harness have anything to do with why my REVERSE Lights blink? Im
semi-educated in trailer wiring, but i cant figure it out.



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