bulkhead Ammeter connectors

Just remember the power to the instruments is not coming from the ammeter. The nominal 12 V into the fuel gage IVR comes from the key switch. It takes a pretty high current to take out the ammeter shunt. Lots of other things will melt first. If the current is real high, it will take out the fusible link. If its 'only' moderately high, it will melt the insulation around various terminals and for those retained in plastic housings (like the bulkhead multi-connector) melt those too. Pictures of some melted terminals