2000 E350. I've just hooked up a car to be towed behind my Motor home. All wiring checks out and works fine with one exception. Towed cars lights flash not bright enough. I checked the ground link. It's good. Suspect flasher relay. I have not been able to find any real info on the relay. Does anyone make a heavy (or heavier) duty flasher?

Thanks

 

There is almost no chance of the relay having anything to do with the problem.
Try the Towing, Trailers And 5th Wheels forum for more information about troubleshooting this sort of problem.

The MOST LIKELY problem is a poor ground connection from the motor home to the car.

The next possibility is a poor connection either at the plug or at one of the places the wiring is connected (most likely wherever you had to splice into the car wiring).

Check the voltage at the motor home connector...
First check it with nothing connected, then recheck it at the motor home side of the connector, with the car connected.
If the voltage is the same, the problem is within the wiring to or in the car.
If the voltage is lower, you have a voltage drop on the motor home side.

In either case, start following the wiring from the connector between the motor home and the car in the appropriate direction. Check each point where there is a connector or splice.

 

Don't know if this is the same problem, but if your car lights are being controlled by the flasher in the motor home, you can swap in an electronic type flasher unit replacing the old Bi-Metal flasher.

The way you can tell is if the flashers work fine on the motorhome by itself and then the flashers either slow down or stop when you hook up the car/trailer, then you probably need the electronic flasher.

These flashers do not rely on the heat generated by the current draw thru the Bi-metal. Instead they have a timer which causes the flasher to flash the same speed all the time.

This might be the cure for you.

Don't know what they cost since the trailer dealer put one in my truck for free when the new trailer I just bought did exactly this.

I would assume any RV dealer or supply shop would have these flashers. They look just like the regular ones and plug in the same way.

Good Luck,

Jim Henderson