No 12v input from battery, 2004 Terry Trailer

BEagen wrote:
Thanks for all of the advice/responses. The positive battery cable goes under the A-frame and immediately up, into the floor of the trailer. I traced it with a tracer and it is unbroken back to the power boards/center and converter. No inline fuse/junction/etc. Googled the manual for the WFCO 45 amp converter and viola! Found 2/30 amp fuses (specifically for reversed polarity) on the "back" of the unit. Access to the fuses was virtually impossible due to where/how it was mounted. Managed to dismount the unit enough to coax the fuses out. Visual and continuity tests indicated they are OK. Even cleaned the ground for the neg. battery cable. At this point I figure the (14 year old) converter is shot. Thanks to all who came to my aid. Wish it had resulted in a better (cheaper) outcome. Stay safe.

The reverse continuity fuses should be between the batteries and the converter. I would recommend taking a voltage reading from the slots in the back of the reverse polarity fuses to a good ground. This way you can measure the voltage while the fuse is plugged in.


Remember that voltage and then compare it to the voltage at the batteries. The two numbers should be very close to each other.

If you read 12.xx volts at the batteries and 0 volts at the reverse polarity fuses you have a fuse or breaker problem that you still need to find.

Another thought. if you look carefully at the circuit board the fuses are on you will probably see where the battery charge wires are soldered in. They will be bigger wires and the board might also be labeled 12v pos and 12v neg. Take a reading between these two posts. If you read 12v your wiring is good from the batteries to the board. If 0 you have a bad circuit breaker or fuse to find. If 6v your batteries are still wired incorrectly.