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Old 05-09-2012, 05:21 PM   #1
Junior Member
Join Date: May 2012
Location: Utica, new york
Posts: 1
Help with reverse polarity fuse

I recently reversed thepolarit when installing the batteries. I blow both 40 amp fuses on the inverter/converter, also the 5 amp reverse polarity fuse in the fuse box in the pass through storage compartment. This fuse box has fuses for the front jacks, slide 1, slide 2, rear jacks, awning, porch light, docking light, external speakers and garage lights. After correcting the battery issue and replacing all fuses, the 5 amp fuse in the box contjnues to blow. Can anybody help me correct this problem?
Kenbowman is offline   Reply With Quote
Old 05-09-2012, 05:36 PM   #2
Senior Member
Join Date: May 2011
Location: Full-timing
Posts: 447
You probably have some electronic device hung on that 5-amp circuit that may have been damaged by the reverse polarity and now looks like a short. For instance many electronic devices have a diode across the power supply input so that if reverse-polarity power is applied the diode will conduct and blow the fuse before more damage can be done... trouble is that sometimes the diode doesn't like all that current and shorts permanently. Anyone who repairs electronic devices has seen this many times.

Anyway, you need to disconnect devices on that 5-amp circuit one by one and find out where the short is. If you have a multimeter you can use that instead of going through a bunch of fuses.
smiller is offline   Reply With Quote

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