Well I am not familiar with your coach, but while you are waiting for someone who is to respond, the Magnum drawings (per attached link) seem to indicate a 5 amp fuse near the batteries (likely coach/house batteries). I would start looking near the batteries or near the magnum controller unit first.....or trace the wire from the pin shown on the Magnum control unit. I would think if it is an in line fuse it would be close to either end (famous last words).
http://www.magnum-dimensions.com/sit...sheet_revc.pdf
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