Trailer lighting

[mep1811]

In prepping my M416 for a trip I noticed the trailer D/S lights to be very dim when connected to my truck.

The truck's the D/S blinker and parking light are dim as well. When I disconnect the trailer the lights on the truck are back to be being bright.

What is causing this ? A bad ground on the trailer?

I look forward to your advice.

 

[ntsqd]

Sounds like a high resistance short to ground. Inspect the trailer wiring from inside the plug back. Might be something like a broken wire strand making contact where it shouldn't.

 

[mep1811]

Thanks

 

[Rubiconcruiser]

Bad ground. Simple fix. Ground both rig and trailer separate . Solid no rust no paint surface .

 

[love2fly]

Also you might consider going to LEDs on the trailer if you already haven't depending on type you have. Much brighter. Do not remember were I got them on line but well worth it.
Cheers