After a long time of not playing auto electrician, I’ve relearned that method with endless aggravation on my old ragged jeep collection.
Yup.
Old Jeeps are particularly susceptible to ‘bad ground’ syndrome.
I only have one right now, a 1971 Jeepster Commando (with the Buick Dauntless “Oddfire” V6) and it is definitely in need of “treatment”. I’ve been trying to find the time for the last month.