Re: Electrical short Fuse blows:
Reply #4 –
Yahoo Message Number: 112023
On my 2000 Magna, wire #134 starts in the front run bay connected to a 20 amp circuit breaker on the fuse panel and runs to the coolant boost pumps that help engine coolant get to the dash heat exchanger. There are two pumps on my coach, one in the engine compartment and one up front. You may also see reference to these pumps as 'bus' pumps.
Those pumps run anytime the ignition is turned on.
Most of the failure problems with these pumps is a significant coolant leak when the seals fail.
I don't know where the front pump is but I've read it is under the passenger side headlight. I know the rear pump on my coach is above the transmission in the engine compartment.
If you have a problem with one or both of these pumps many people have simply bypassed them with a short coolant hose and pipe nipple. Those that have bypassed the pumps haven't reported a problem with their dash heater.
If the pump(s) cause the fuse to blow you could disconnect the pump and see if the pump is the cause of your problem.
pete
2000 40' Magna CAT C-10, #5892