I only have high beams on my 61. Thought it would be easiest to parts shoot, and have changed the dimmer switch, as well as the headlamp switch on the dash. The dimmer switch (new and old) seems to toggle from high beam to an off state. So other than having two new switches, nothing has changed.
My guess would be bad ground to the low beam, but have not tried to chase it. Previous owner wired in a toggle switch for the dome light, so it no longer operates through the headlamp switch.
I hate the thought of an electrical problem, and it's clear some things have been spliced behind the dash.
If it were your truck, would the next logical thing be to replace the Under Dash harness? That would get me a new fuse block, connectors for headlamp switch, ignition switch, dimmer switch and firewall connectors. If that takes care of the high beam, it should also take care of the dome light.
Thanks!
Last edited by Cathy; 01/31/2018 8:12 PM.
