Fixing the lights on a trailer

[JMJ Farms]

Could a broken marker light knock out all the lights?

Highly unlikely. The only thing all lights would share in common should be the ground. And there should be three to six different fused circuits on the truck side, depending on what's hooked up. Running lights, turn signals, brake lights, electric brakes, backup lights, and a 12v hot plus a ground. As mentioned a good test light is a good place to start. Trailer lights can really try you patience.

 

[True Grit Farms]

Could a broken marker light knock out all the lights?

Highly unlikely. The only thing all lights would share in common should be the ground. And there should be three to six different fused circuits on the truck side, depending on what's hooked up. Running lights, turn signals, brake lights, electric brakes, backup lights, and a 12v hot plus a ground. As mentioned a good test light is a good place to start. Trailer lights can really try you patience.

It's easy to just replace everything with sealed LED trailer lights and new wiring. We're forever screwing with trailer lights on our boat trailers, saltwater will find the weak link.

 

[Txpiney]

Could a broken marker light knock out all the lights?

Highly unlikely. The only thing all lights would share in common should be the ground. And there should be three to six different fused circuits on the truck side, depending on what's hooked up. Running lights, turn signals, brake lights, electric brakes, backup lights, and a 12v hot plus a ground. As mentioned a good test
light is a good place to start. Trailer lights can really try you patience.

It's easy to just replace everything with sealed LED trailer lights and new wiring. We're forever screwing with trailer lights on our boat trailers, saltwater will find the weak link.

What grit said would cure your problem for a long time to come. If you have any scotch lock connectors in the wiring. Cut them out and use heat shrink conebut connectors. That in itself will eliminate alot of issues. As most have said. A good ground between truck and trailer is paramount.

 

[JMJ Farms]

Could a broken marker light knock out all the lights?

Highly unlikely. The only thing all lights would share in common should be the ground. And there should be three to six different fused circuits on the truck side, depending on what's hooked up. Running lights, turn signals, brake lights, electric brakes, backup lights, and a 12v hot plus a ground. As mentioned a good test light is a good place to start. Trailer lights can really try you patience.

It's easy to just replace everything with sealed LED trailer lights and new wiring. We're forever screwing with trailer lights on our boat trailers, saltwater will find the weak link.

Amen. I have swapped some over but not all. Got ready to take my two boys fishing in April. Hooked up to take off and no lights. None. Come to find out a rat had crawled up in the tongue about 4 feet and gnawed the whole harness in
half.

 

[True Grit Farms]

Scotch lock connectors, more proof that easy and cheap, doesn't equal good.

 

[jehosofat]

Scotch lock connectors, more proof that easy and cheap, doesn't equal good.

The guy that invented those things should be hung, right next to the guy that invented straight slot screws.

 

[Txpiney]

Scotch lock connectors, more proof that easy and cheap, doesn't equal good.

The guy that invented those things should be hung, right next to the guy that invented straight slot screws.

If you WANT problems I a wiring harness, using scotch locks WILL guarantee it, not if, but when.

 

[Nesikep]

Scotch lock connectors, more proof that easy and cheap, doesn't equal good.

The guy that invented those things should be hung, right next to the guy that invented straight slot screws.

AMEN
I bought a new trailer and it was ALL put together with those darned things.. first thing I did was rewire it with heat shrink tubing, dielectric grease, etc.