WFCO 100 amp converter/charger

[sundancer 87]

If you have one of the often maligned WFCO converter/chargers that doesn't work you may want to check the internal 20 amp fuse.
The 20 amp fuse is on a daughter board that protects the hot side of the 110 volt input.


I noticed my battery was dead so the first thing I checked was the Surge Guard 34750. The red trouble LED was shining and of course had killed output to the hauler. I toggled the breaker and thought that would be the trick not knowing why the trouble LED was prompted to show.


Went out the next morning and the battery was still discharged so the next step was to check the battery. All cells wet up to the cat's eyes and it is a fairly new battery.


Next step was to check the WFCO to see if there was any output. None at all, not even the LEDs had voltage. Checked the outlet and it was powered as needed.


That left the converter/charger itself. Nothing going to the battery so it was time to diagnose the problem.


After drilling out a dozen rivets and removing the top I discovered the 20 amp fuse on the daughter board. Metered the fuse and found it open but I couldn't find a 20 amp 250 volt axial lead fuse in my stash so I soldered a fuse holder to the circuit board pads to use a normal push in type of fuse.

Everything looks good so a trip to the store tomorrow for the proper fuse and then a smoke check will be in order.


The WFCO gets a bad rap occasionally but if the problem is an internal fuse I suppose it isn't all that bad. The fuse isn't necessarily user serviceable but it can be changed.