
I hear that.
When you're using a torpedo heater on cold days it's a tough call between being cold, or slowly losing your sanity from the noise of the heater!

I second checking grounds at the core support by the headlights. My K5 had weird turn signal issues and headlight stuff and it was a ground I had accidentally left off and it fell behind my battery when I wired on new headlight pigtails.Look for a ground wire that's right on the upper part of the core support. In my case the wire broke on one side.
. 
.