another trailer light question

[beemeron2]

when I step on brake marker light dims / changes, any quick / easy fix?

[FisherMike]

Is the vehical running?
If not, it could be battery although I doubt it.
99.9% of the time it will be ground although not every time.

No matter how 'good' the ground looks, that is usually the problem. Take it from an ole trucker.

[Barnacle Bill]

Yep, check your ground.

[Wichita]

Yep sounds like your losing voltage due to a bad ground connection. A little sandpaper on all the grounded points should do the trick. Wouldn't hurt cleaning you battery terminals also. I've pulled trailers for over 15 years and it's a never ending battle.

[poppop]

definately a ground problem

[beemeron2]

thx guys, will giver a try.