Installing a 30 amp fuse would only be a problem for the # C56496 if there was too much of a power draw which could damage the converter. This has a higher rating so it would take more to blow the fuse. I recommend reinstalling a 10 amp fuse like the one that originally comes with it. Curt would have included a fuse with a higher rating if a higher load was safe.
I'm not sure what part of the wiring harness isn't working so I would swap out that fuse and then double check all of your... view full answer...