Jeff,
The regulator is a switch. If your generator has the capacity to put out 50 amps, and your regulator is adjusted to a max of 25 amps, the regulator will not allow your 50 generator to output more than 25 amps.
I think regulators were specific to MODELS of rigs...(just a hypothetical example) the manufacturer knew that a '52 Pontiac had A/C, rear window defroster and giant sub-woofers. This car had a 60 amp generator and needed every bit of it..so, the regulator for the '52 Pontiac was factory adjusted to 60 amps.
To get net on this tirade, the regulator might be of the proper voltage, 12V, but might not be matched to the output of your rigs generator.
If this guess is correct, the trick is finding the old fart at the electrical shop who can tweak the unit to match the gen output. Keep in mine this is all supposition on my part, I am a not generator guru!
Just for the record, a fuse is for over current protection of a device or circuit, it won't control or regulate a system.
Stuart
