D150 wiring issues, help!

Used to see this, all the time, back in the 70-80's, my "parts store days." Winches, snow plow lifts, big *** off road lights. Dual batteries, campers. Melted ammeters.

This even started to happen on my 70 RR 440-6. I had the cluster out, it was built for a "tic tok tach" which never got fixed, and I guess I was putting the mechanical tach in, big Jones-Motrola in the original tach hole. Ammeter was starting to melt the cluster. Also in that car, the bulkhead connector got damaged from heat. I drilled through it and ran larger wire straight through.

I was then (and am now) a radio amateur and at some points ran some radio gear in the car, as well as a pair of 100W 4537 aircraft landing lights. THOSE were AWESOME in their day.

Terrible old faded photo, about 74. By then I had swapped a 340 into the car

70RR.jpg