No power except microwave when plugged into shore power.
In trouble shooting we found battery disconnect switch blowing one of two 5 amp fuse on 12 amp system relay? Any help is greatly appreciated!
Forum Discussion
I assume the 5A fuses are for the relay's coils. (This typically is a latching relay, with a momentary dual-throw switch to turn it on or off.)
That would suggest that there's a short circuit in one of the coils for the relay or in the wiring to it. If it's the coil, presumably replacing the relay would be required. If the wiring, obviously correcting the short is needed. You should be able to figure out which it is by disconnecting the control lead(s) in question from the relay and measuring things with an ohmmeter. The relay coil should have at least 2.5? to 3? resistance, assuming the fuse is appropriately sized. Some analog meters might have trouble being very accurate at such low resistances.
EDIT: If you are willing to (temporarily or permanently) do without the 12V disconnect, you could bypass the relay by connecting the two heavy wires on it together on the same stud. Disconnect the negative terminal of the battery before doing this and make sure it's not grounding out before reconnecting the battery.
That would suggest that there's a short circuit in one of the coils for the relay or in the wiring to it. If it's the coil, presumably replacing the relay would be required. If the wiring, obviously correcting the short is needed. You should be able to figure out which it is by disconnecting the control lead(s) in question from the relay and measuring things with an ohmmeter. The relay coil should have at least 2.5? to 3? resistance, assuming the fuse is appropriately sized. Some analog meters might have trouble being very accurate at such low resistances.
EDIT: If you are willing to (temporarily or permanently) do without the 12V disconnect, you could bypass the relay by connecting the two heavy wires on it together on the same stud. Disconnect the negative terminal of the battery before doing this and make sure it's not grounding out before reconnecting the battery.
