Dash lights could be a loose ground but with the interior lights not working ........ Pull the light switch and use a meter to see if you are getting output voltage from the headlight sw. If you are soulnds like you have a loose or disconnected ground. Try hooking up a temp wire to a good ground and touch it to the gound input terminal/wire on the dash panel
I've been rasslin' with wiring nightmare on a 64 Galaxie 500.
I ran across a wiring diagram for it, and found that it's no wonder it's such a nightmare.
Ford had a "better idea".
Could be that the rheostat for the dash lights has gone kaput.
here's where I found it: 57-65 Ford Wiring Diagrams
What I'm fighting with is the swap from generator to alternator, (done by someone else) and the alt. won't excite, and the "gen" light won't work.
I'm getting ready to install a GM ALT. with internal regulator.
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