Allpar Forums banner

Looking for '86 Mustang headlight wiring diagram

7409 3
Hello everyone,

My wife has an '86 Mustang LX. She's having headlight problems- only high beams work. I've tried replacing the dimmer/multi function switch, headlight relay, and new low beam headlights without any success.

I'm trying to find a wiring diagram so I can troubleshoot the system or suggestions on what to try to get the headlights working.

Thanks for reading!
1 - 4 of 4 Posts

· Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,022 Posts
Make sure that both low beam filaments aren't burnt out if you have voltage at the low beam headlamp socket terminals.

· Registered
35 Posts
Discussion Starter · #4 ·
I have tried new low beam sealed beams. Didn't make any difference.

I have used my test light and there is no power to the low beam (black/green) wire at the low beam socket. There is power to the high beam wire in the low beam socket.

Have replaced the dimmer/multi function switch twice, replaced the headlight switch (the one to turn the headlights on), and also the headlight relay.

Now, that I have the wiring diagram I can hopefully trace the wire and see where it looses power.

1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.