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Where do the headlamps ground at?

Luke_Healey

Jedi Trainee
Offline
Tonight I was fiddling around behind the dash for some other reason. I did an electric check and noticed that everything was working except the headlamps. Three hours later, I ended up having to make my own ground wire up at the grill and bypass the black wire that supplies ground to each of the headlights.

So, do any of you know where that ground wire under the grill terminates elsewhere in the car? I'd like to get things hooked back up how they are supposed to be.

I figured that I knocked something loose under the dash somewhere. The wiring diagram I have in an old service manual doesn't have the grounds drawn to true scale, showing where they should terminate.

To make things more annoying, the previous owner sprayed the entire engine bay in black paint, so every wire under the hood is 'black' unless you take time to rub the paint off of them.

In this case, I'm talking about the legitimately black headlight wires that meet at a three way junction with a fatter, black ground wire that disappears into the cloth harness.

A symptom that may be specific to my issue is that the high beam indicator in the speedo was illuminated when I turned the headlight switch on regardless of the setting of the floor switch. Once I grounded the headlights, that issue went away and the indicator worked as it should.
 
Luke - On mine its a black wire with a ring terminal on the pass inner fender. Not sure if that's original or not.
 
mine is on the driver's inner fender ('76) a few inches back from the rad sheet metal though there is lots of places to ground there - like any bolt to the body
 
Yes, the grounds come together from each headlight then go into the harness, back through the rad firewall and ring terminal on the inner fender just a few inches inside the engine bay. I just put relays on my headlights and horn and redid this. Relays really help with brightness and probably will save your dipswitch (mine was trashed).
 
Weird. So I guess I probably didn't bump something under the dash. It's weird that the car chose that particular moment to drop the headlights. My new grounding point is one of the bolts that holds the grille on, and it's working well. I think my lights are brighter. I'll try to find the original point though. Thanks!
 
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