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Some of those are fused on the back of the module..........depending on who made them. Pull the whole thing out and look. And if you have a 12 VDC test light this is pretty easy to trouble shoot. About $5 at most automotive or hardware stores and great to have! Let me know what you find and if you have a test light, I can direct you in some testing. All follow ups are included in our fee.
If you have a 12 VDC test light you can find out quickly if the problem is in the board itself or if there isn't any power into it.
Did you check the power where it comes INTO the board........not the switches? And most of these will be fuses in with another part of your 12 VDC systems and not separately.............check them all with your test light. IF all test good, then chances are it will either be a bad ground OR a break in the circuit someplace. The ground lead usually is white........but, give me the colors and number of leads coming INTO the board........not just the switches. Those should all have a common feed off the board.
Are you talking about the battery disconnect switch as the "aux battery side" on this?
Can you attach a photo of the area you are talking about. The two 6 VDC batteries are functioning as the "aux battery" is what I am understanding. Where are you hooking up the power to make all the gauges/lights work? It sounds like the problem is in the auxiliary battery disconnect switch...........one side has power and the other doesn't. IF NOT, please explain further.
IF you go back and look you indicated you checked the fuses first......so I didn't suggest that as a cause. That is always the first place to check. Sorry that didn't come across well......but, glad you got it sorted out!