External Power-Reverse Polarity Contactor

[wslade2]

I’m an E model, so don’t know if this applies to you. But my external power wiring and circuitry/contactor is in the space under the battery and next to the exhaust. In that location, the wiring has rotted pretty good from acidic gases and heat. I just capped it all off until I can do a proper repair. If yours is also in the space under the battery near exhaust, it may have been gutted and simplified due to acidic rot.

My sheet metal was taking a hit so I cleaned it up and painted with aircraft primer to protect. Worth taking a look down there. Examine carefully under and around your battery for corrosion.