trialer lights

[HUNTINGBAILEY]

I bought a used utility trailer, the lights didn't work. So I rewired the trailer and got new lights. Problem is the brake lights go off when you apply the brake pedal instead of getting brighter. The signal lights works fine. The lights are grounded.
I even tried switching wire colors to the lights.

What's the problem?

I don't have this problem with my boat trailer it works fine (same vehicle)

[Fisher Dave]

Valv hit the nail on the head. Be sure the white wire is grounded well on the towing vehicle .. be sure its touching bare metal.. rust and corosion often are the culprit.

Also be sure the lights you just put on are grounding properly to clean steel.

[HUNTINGBAILEY]

I bought a used utility trailer, the lights didn't work. So I rewired the trailer and got new lights. Problem is the brake lights go off when you apply the brake pedal instead of getting brighter. The signal lights works fine. The lights are grounded.
I even tried switching wire colors to the lights.

What's the problem?

I don't have this problem with my boat trailer it works fine (same vehicle)