So I've searched the net and can't find what I'm looking for. I need to wire up a harness for a trailer. Obviously since subaru has a separate blinker I need an adapter. I found this online. Which is exactly what I want. But I don't want to buy something like that. I have a box of relays, wires, and I have a soldering iron and I'm not afraid to use it. Just wondering if anyone has a diagram on how to make one. I can't get my mind wrapped around an efficient way to do it.

What I wired up made the trailer lights blink opposite to the car lights and used an ungodly amount of relays.....

 

Thanks for your input

What year and model is it?

It's an 89 GL. But it should be the same for any car that has separate blinkers from the tail/brake lights.

I'll move it to General, you'll get more hits there.

Cool, thanks.

I just hooked up trailer wiring on my 88 GL-10. It was pretty easy, one wire goes to the left taillight and the others all go to the right one. I used an adapter, $14 from Wally World.

 

I pulled the pins from the connector and piggybacked mine by soldering them on to the pins. Then I pushed both wires back into the connector.

 

You'll need an XOR gate function; it won't be very easy to make. Here is some food for thought - on the bottom left is a schematic from a patent:

http://cr4.globalspec.com/blogentry/9465/DIY-Trailer-Hitch-Wiring-Solutions-Part-2

Thank you very much!!!

That's exactly what I was looking for. I have gone through most the logic he's gone through there with the basic wiring, but was hoping there was a more simple way to do it than that. Maybe I'll build something like that though. Thanks again for that page