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I don't think there is a fuse. On my HR Ambassador my black tank indicator it shows full all the time on the inside monitor. I have another monitor outside and it works correctly. I think it may be a failure of the small control board behind the control panel. Just my guess.
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Take a look at this thread may help.
When I adjust my pots if water comes into the shower GRAY tank is full.
Other two black tanks, go camping for weekend and use flashlite to monitor when full to floor line that tanks full.
When you fill LP tank adjust knowing its 80% full.