erratic amp gauge and lights dim

[richardmoparman]

My 68 has a problem with the the amp meter jumping and at the same time the dash lights go dim and get brighter and am also having a problem with the headlights going dim at idle.They will brighten as rpm's go up.Any thoughts and or suggestions on what might be causing this and how to fix the problems.

[Dino]

Pretty typical.  You can do a relay upgrade, do a search for headlight relay on this site, or you can upgrade the alternator.  Denso 120 amp is going in mine.  The latter will fix all the idle issues, I bet you can't really use the windshield wiper at idle either.

[Nacho-RT74]

upgrade alternator and wires, beside a HARD mantenience job on bulkhead conectors and back of ammeter are the only solutions