Originally Posted by windmill602a
Typical trailer lights have a combination brake/turn signal light (red). My motorhome has separate lights and wires for brake (red light) and blinker (yellow light). How do I wire the motorhome to the trailer? Note: the other lights are no problem to wire.
I assume that if I connect the blinker wire and the brake wire from the motorhome to the single brake/blinker wire on the trailer, the motorhome blinker lights will come on when the brakes are applied and vise versa.
First, let me ask you something. Do you have a 7-pin plug on the back of your coach already? If so, have you checked the output of each pin in that plug? If so, what were or are, the results?
If you don't have trailer plug on the back of your coach, first, that would be kind of "abnormal" and second, then you'd have to tie into each wire that is supplying power to each filament, in each tail light. You only have to tie into one side for what's called "tail/marker" lights or, in the old days, "running lights".
But, what you'd have in a wiring bundle, leading up to a plug on the back of the coach would be,
1. Rt turn
2. Lf turn
3. Brake lights
4. Tail/marker lights
Now, what most folks would do in this situation is, add what's called a TAIL LIGHT CONVERTER. What that does is, takes the separate turn signal and brake lights into the input side of the converter. Then, on the output side, you'll have a COMBO-BRAKE-TURN, for each side.
1. Rt turn/brake
2 Lt turn/brake
You'd then take the out put side of that converter and, wire it into the trailer plug at the rear of the coach. Now, you'll have a what most would call a normal plug. So, when it comes to wiring up the trailer, you're all set.
And, while some suggest going to an Auto Zone or, many other standard auto parts stores, I've found that these TAIL LIGHT CONVERTERS are not normally stocked because they are not a high sales item. That doesn't mean you're not going to find one there, it just means that when I've searched my local auto parts stores for that particular Tail light converter, they looked sideways at me (kind of like that crooked head puppy look).
What you want is called a THREE WIRE TO TWO WIRE. And yes, there are TWO WIRE TO THREE WIRES ones too. Those are more common. Below is the exact one you need from Amazon. I've done this type of setup a zillion times so, if you've got any questions, please feel free to PM me, be glad to help.
Curt Manufacturing 58240 Tail Light Converter 3 To 2 Wire