1978 F250 Custom Camper automatic 460
I am struggling!

I finally got the right turn signal harness and thanks to the pictures I took of the original wiring in the plug I was able to line the new wiring up with the color code that matched the old wiring.However when I plugged it in to the main plug I got a mess. With the turn signal off it's like the brakes are on, when I moved the signal to right or left the brake lights went out.

When I look and the main plug the color codes on the wire are different than those in the new harness, soo, where do I star and what do I do?

thanks

 

maybe you could get a tester light and go thru each wire on the truck one by one and see which lights up when turn the signals , lights or brakes on one at a time , having a helper to turn things on would be a great help , good luck .

 

Here is the wiring diagram for 1976-1978 F-Series. Hope they help: