No running lights

[Jeff Hahn]

I had not had my Lund in the water for some time, until today. Last time I towed it, everything worked fine. This morning, I didn't have running lights. Brakes and turn signals work fine, just no running lights. On the way to and from the lake, if I took a turn and could see one side marker light, I'd switch the headlights on and occasionally the side marker light would come on very dimly but the next time, it wouldn't come on at all.

To me, this has all the earmarks of a bad ground wire somewhere. All system on the truck work fine and no fuses blown. Again, brakes and turn signals work fine, just no running lights. When I got home, I checked the main ground wire that attaches to the trailer...took it off, wire brushed everything, put di-electrical grease on everything and reassembled...no help.

Any suggestions before I start tearing into the wiring harness of the truck and trailer?

[CatFan]

Doesn’t sound like a ground issue to me. The ground at the tongue would affect all lights on the trailer. The lights are grounded individually at the fixture. My guess is a connector problem or a chewed up brown wire.

[bshort]

Is your tow rig a 2019 GMC/Chevy 1500 with the advanced trailering package by chance?

[Jeff Hahn]

Is your tow rig a 2019 GMC/Chevy 1500 with the advanced trailering package by chance?

Nope. 1993 Chevy Suburban.

[Jeff Hahn]

Doesn’t sound like a ground issue to me. The ground at the tongue would affect all lights on the trailer. The lights are grounded individually at the fixture. My guess is a connector problem or a chewed up brown wire.

Thanks, I'll check it out.

[gordonsweb]

I have same issue going on 2014 Silverado, intermittent blowing 20a fuse in truck. Soon as I get a chance we are going to unhook one side of the running lights on trailer and drive for awhile. Then do the other side to see if we can find out which side is causing issue. Then just may have to run new wire. I am sure it is rubbing somewhere and blowing fuse.

[bassnman81]

Jiggle the pigtail wile hooked up and see if that's it.

[Jeff Hahn]

Jiggle the pigtail wile hooked up and see if that's it.

I jiggled the crap out of the pigtail on the boat and on the truck...didn't make a difference. Also, I checked all fuses in the truck and they are all good.

[billnorman1]

Try spreading the male pins on the flat connector, shoot them all with WD-40 and try that first it's easy. There are splits on the pins that a tiny screwdriver will spread out.
Jeff, at this time it sounds brown wire connected rather than ground.

[RangerRic]

"There are splits on the pins that a tiny screwdriver will spread"

Never thought of that - Thanks !

[haveme1]

My marker lights were ground out on trailer. Tape behind the pos metal and the trailer showed me the problem.