**trailer brake lights not working**

[kevin07]

seems to me your car has to be wired wrong check the brake connection v the one on your wifes car if same hmm I would run a wire direct from the battery to your brake light wire on the trailer and see whats happening

[Warwick89]

Ye not earth pin if the other lights are ok .
Is the brake pin firm in the female end and ring on the male it could be getting pushed away when you plug it up, just try pushing on them... Its going to be something simple and you will kick yourself lol

Haha I hope it's simple but I'd still like to figure out what it is soon I have so much to do and running out of time. Their both firm and can't be moved.

[kevin07]

seems to me your car has to be wired wrong check the brake connection v the one on your wifes car if same hmm I would run a wire direct from the battery to your brake light wire on the trailer and see whats happening and hopefully that wont work either then you will get an answer

[Warwick89]

Has it got those dumb a$$ scotch clips joining the plug to the the harness , they are renowned for failing to make a solid connection

Opps just saw mudnuts post

Nope looks like all connection are soldered. If it was a bad connection would I still get te 13.5v reading?

[Warwick89]

seems to me your car has to be wired wrong check the brake connection v the one on your wifes car if same hmm I would run a wire direct from the battery to your brake light wire on the trailer and see whats happening

I've towed with my car before actually only 2 weeks ago and haven't ever had an issue. Checked the wiring already and all good at the plug

[TPC]

As others have said, it is probably a bad connection where it is being tapped off, possibly with scotch lock (worst thing electrical ever invented).
You will probably measure volts fine until there is a load and then it will drop.

[mudnut]

Are the trailer lights LED or globes. If it is globes, the high wattage brake lights draw way more current than the others. And yes voltage can be present with a high resistance joint, but when current is drawn, most of the voltage is across that joint instead of the lights.

You beat me to the punch, Tony

[Warwick89]

Are the trailer lights LED or globes. If it is globes, the high wattage brake lights draw way more current than the others.

The light are LED

[mudnut]

Yeah, they don't draw a lot of current, but need a good connections to work properly. You might have to measure the resistance between the socket and the brake lights by taking a light assembly off the car.

[TPC]

If you take the cover off the plug and plug it in you can test the voltage while under load.