Cargo trailer battery?

Before you power anything, use your meter to check for continuity on the various circuits. All 12 V devices will have one wire to ground and one wire for power. The color schedule is immaterial. If you have a light fixture with two wires, one will have continuity to ground (the frame) and the other will not. Connect power to the ungrounded wire.

westend wrote:
Do you have a hand held meter?

yes i do, not sure what to do however, i use to use just to check voltage at my previous job but short of being able to see if circuit has 120 volt or not that's my limit

Specifically for ETRAILER Trailer Wiring

Mine has 7 pin connection

A 7'x16' enclosed trailer is likely to have brakes; mine does. Does your trailer have brakes? A 4-way flat plug or a 7-way round RV plug?

Do you have a hand held meter?

Well that's my big issue is all possibilities. I'm terrible with wiring, I don't understand it ,maybe a pro is the way to go

For a cargo trailer that is set up with a 4-way flat plug, the manufacturer typically hooks the inside light to the tail/marker light feed (normally brown). Their correct assumption is that you will need the inside light when you have the vehicle running lights on. Even though my 7x10 trailer came with a 7-way plug (due to having brakes) my interior light was still hooked to the tail/marker light feed.

I have purchased from E trailer several times and have always received great customer service.
One item was badly damaged and they happily and speedily replaced it.
I would not hesitate to purchase from them again.

Yes, eTrailer is a parts store but they post lots of self-help detailed instructions and videos.

They are also an excellent business to purchase parts from as they understand customer service very well.