Checking those fuses is a good idea but I don't rely on those monitor
lights because they seem not to be very accurate. I bought a voltage
monitor at Gowesty.com that plugs into the cigarette lighter.

http://www.gowesty.com/Merchant2/merchant.mv?
Screen=CTGY&Store_Code=gw&Category_Code=ac-elec

Its maker claims it's accurate within a tenth of a volt, if I recall
correctly -- and it does seem to reflect actual battery performance.

Regarding the water level monitor, mine is wildly inaccurate. If anyone
knows how to correct this, I appreciate the information. Good luck.
Dan
89 Westy in Madison, WI