Your holding tank vent is blocked, which has pressurized the system. The vacuum pump has overheated trying to push waste into the tank and tripped the breaker instead of burning out.
The VacuFlush pump has nothing to do with pumping out the tank...although if you have no power on the boat at all, the overboard discharge pump that DUMPS the tank couldn't run. If you can't pump out using the marina pumpout, it's again due to a blocked tank vent. If there's no source of air to replace contents as they're pulled out by a pumpout or onboard discharge pump, the pump will pull a vacuum that prevents anythng from being pulled out.
If there's a filter in the vent line, and if you've overfilled the tank, it's most likely the culprit...'cuz filters cannot get wet...the charcoal swells up and blocks the vent. No filter, the vent thru-hull is the first thing to check...dirt daubers love to build nests in thru-hulls.
You need a VacuFlush owners manual...it includes just about every possible symptom, probable causes and cures that a V/Flush system can develop. Download and print one from here
And keep it on the boat! Doesn't matter how old your system is...the VacuFlush hasn't changed enough to notice except cosmetically since it was first introduced in the late 1970s...the trouble-shooting guide hasn't changed in any version of the owners manuals either.
There are other possibilities. If it's not the holding tank vent, the next most likely problem is a clog in the vacuum pump....that happens when you don't use enough flush water to rinse it out. SeaLand's claim that the VacuFlush uses "as little as" one pint of water is VERY carefully worded! You need to add at least a quart of water to the bowl ahead of even the smallest amount of toilet paper and leave the pedal down for at least 7 seconds. You need at least TWO quarts ahead of solids, and hold the pedal down for a full 10 seconds.
That should be enough to let you sort out and fix the problem with toilet...I don't have a clue what to tell you about what happened to your electrical system or how to fix that.* But somebody will show up who does.
Oh...btw...the model number for a Vacuflush only refers to the bowl assembly--size, discharge configuration, etc....the rest of the system is identical for all of 'em.
-- Edited by HeadMistress on Thursday 7th of April 2011 09:48:53 PM
-- Edited by HeadMistress on Thursday 7th of April 2011 09:51:26 PM