Actually I'd say mostly of ammeter and bulkhead fails are related to 3 BIG stupidities!!!

1-hook every existant newer accesory to batt
2-upgrade the batt with a more powerfull one, keeping SAME FACTORY underrated alternator
3-the factory guilt misconception ammeter is an alternator gauge where really is a batt gauge

and these three are proportionally related electricity ignorance

every body is worried about some electricity burn around, but our car works with EXTREMELLY DANGEROUS GASOLINE ACTIVATED WITH A SPARK INTO A CILINDER!!! and quite often with backfires trhough carb due whichever reason.

If we use gasoline to make work our cars and everything takes care correctly about it, why not we do the same about electricity ? without any hack up job needed for that!!! just knwoledgement.

mantenience and knolwedgement will save you.

would be great ppl begins to understand about electricity, the same than takes cares about understand a camshaft!