Camper light issues

So...

I have a 2007 Toyota Tacoma TRD Off-road. Recently bought a Coleman Popup camper.

Before picking it up (it’s located 4 hours from me) I tested my trucks towing lights with a trailer from work. They worked great.

Then, had my Father in Law test the lights on the camper using his Dodge. They worked great.

When I tried to pick it up - they wouldn’t work? We couldn’t figure out how to configure wiring (even after extensive diagram googling). The white lights would flash on the camper and the left brake light would light up, nothing else. We tested which wires were hot to help configure wiring, etc.

Any ideas? Buy external lights? SOS!

 

Most likely the trailer has different configuration than you truck.

 

Thanks.

They are both 7 pin (similar to the middle picture you shared).

Any ideas on how to remedy?

 

If all outputs from your truck are good and verified...then the trailer needs to be check and verified also.

 

Yup. Already did that.

 

@Glacier2015 did you ever figure your issue out?

I’ve got a not so similar issue. My brakes/brake light pin in my seven pin connector is the only one not working. (Of course it’s the most important one...)

 

Yes! Turns out Tacoma’s ground through the chassis. Most trucks ground through the hitch. So, we were grounding it wrong. Called a Toyota dealership and they knew the prob right away.