[62galaxiguy]

When i turn on my headlights both low beams come on and 1 hi-beam.if i hit the dimmer switch 1 hi beam goes out and the other one comes on????Always 3 lights on.This is a 4 hl configuration on a 62 ford galaxie.Outer bulbs are lb and inner bulbs are hbs.Thanks for any help.

[66GMC]

This might sound (or be) crazy, but check your grounds.
Cars will do crazy stuff when the grounds get bad.


NAPA OES 7706119

Get some of those braided ground straps and use them everywhere there is something electrical with any kind of insulating rubber or moveable hinges.

Engine to frame
Frame to Rad Support
Firewall to Hood
Package tray to trunk lid
... etc.

[cdminter59]

If the old Fords were wired anything like Chevys check the headlight sockets. The sockets had a ground wire grounded to the radiator support.

[T-bucket23]

I would grab a test light and check for power and ground at all the light sockets with the bulbs disconnected. This should shed some light. As others have mentioned grounds are a very common issue and most likely your problem. By disconnects all the lamps you should be able to isolate the issue

[WriterDennis]

You should always check the grounds if you have a wiring problem, as it is quite often the culprit. Not always, but more often than not. If that is not the problem, use a test light to isolate the problem.

Dennis W. Parks
Author of automotive how-to books