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| You should be able to determine which fuse by tracing the wire, tug on it and trace it a few inch's at a time until you are there. There is a pretty good chance that that switch is already powered, if it is illuminated (my crestliner has) you could pull fuses one at a time and see which one the light on the switch goes out. Most of the stuff is labled on the fuse block, so that should narrow it down to a couple options. I would put the same amp fuse in the fuse block that came with the unit in-line (usually 3 amp), no need to double fuse-every connection is a corrosion point, limiting these is best. I would advise against a relay, relays are for larger loads that the switch contacts couldn't handle, not the case here, just another problem point. Remember if you have two graphs networked, and the gps puck on the network, you have to have a switch on the network.
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