Trailer wiring.

.Good morning everyone,

I’m having an issue with my 2023 Phoenix Cruiser and hoping someone here has run into this before.

When the RV is not connected to a trailer, all lights work properly (turn signals, brake lights, running lights, and reverse lights).

However, when I connect any trailer:

I only get running lights
No brake lights or turn signals

I’ve tested multiple trailers, and they all work fine on other vehicles.

I also checked the plug on the RV and am only getting power to two wires (running lights), which matches what I’m seeing on the trailer.

I looked in the fuse box and noticed positions 73 and 74 are listed as not used, which made me question where the trailer light power is actually coming from.

My question is:

Is there a converter or module somewhere in the RV for trailer wiring?
Or does the trailer wiring rely entirely on the Ford chassis system?

Any guidance on where to look or what to test next would be greatly appreciated.

Thank you.

Hey everyone,

Quick question—does the rear trailer plug on a Phoenix Cruiser run through a converter, or is it just controlled by fuses?

I’ve already checked the fuses under the dash and hood, and everything looks good (though I may swap them out anyway just to be sure).

Before I start crawling underneath chasing wires, I figured I’d ask:

Is there a converter on these units?
If so, where do they usually hide it?
Or is this strictly a fuse setup?

Feels like someone here has already been down this road and can save me some time 😄

Thanks in advance.

I've never pulled a trailer or used the 7 pin connector,,, but I did accidently discover where the trailer connections to the chassis are made.  In the bottom of the transition wall behind the diver's seat you can see the connection to the Ford wiring. It's right beside the auto power transfer switch that toggles between shoe power and generator power. From there I'm not sure it it stays above the floor all the way to the rear of the coach. I suspect it does.


To get to it, there should be a carpeted section at the bottom of the wall. There are 2 long screws about an inch or 2 from the top edge holding in the carpet (at least on my mind I learned I didn't need to entirely remove the screws) . Backing them out about half to 2/3rds of the way will disconnect the baseboard.


Hopefully someone has seen this issue before and has better advice.


Larry

Are you using a proper adapter  (7 pin male plug to 4 point female)?

Don