[Richard]

I have run with the gennie and merge switch to power the engine battery before. If the merge switch were to fail, you can easily hot wire the two systems with a battery booster cable. Not recommended, but in a pinch.

I also seized an AC compressor once with the double v belt arrangement. I kept a special set of short belts in the spare parts bin to bypass the AC compressor should it happen again. Sorry I can't tell you the length of the belt, the coach and belts belong to another member now.