Need a battery in your TT for your tail lights to work?

[2lazy4U]

I have a feeling this is a dumb Q, but so be it. I have a bad battery in my TT, and the taillights/blinkers etc. don't work. I removed the battery, but the lights still don't work when plugged into my 7 pin car connector with the car on. My car lights all work fine.

Should the lights work directly from my car's 7-pin plug even w/o a battery in the TT, and I therefore have two separate issues? Thanks.

[SoundGuy]

2lazy4U wrote:
Should the lights work directly from my car's 7-pin plug even w/o a battery in the TT, and I therefore have two separate issues?

Yes to both ... your trailer battery, or lack thereof, has nothing to do with the trailer's running / brake lights. Time to get out your voltmeter and do some checking - here are the pinouts for the 7-pin Bargman connectors.