pianotuna wrote:
Hi Phil,
My oem fuse was in a box inside the engine compartment, more or less straight in front of the driver, and 1/3rd of the way back from the grill. It is right on top allowing easy access. My unit is also an E-450 so yours may be quite similar.
I do see over 70 amps--but because of the circuit breakers which I deliberately got at 50 amps the current is interrupted.
When I first heated water, I kept the power on until the chassis battery was at 12.3. Then I cut it off until it had recovered.
Hmmm ... my high initial charging currents from the alternator to a ~50% discharged coach battery bank don't suddenly stop as if cut off by a fuse. These initial currents merely taper down as the coach batteries charge up. There doesn't appear to be anything drastic happening like a fuse or circuit breaker opening up. :h
P.S. Recall that I know actually what current is going into or out of my coach battery bank at all times via a shunt I installed in the battery bank's negative lead. The shunt voltage feeds an ammeter on the cab dash (actually a voltmeter interpreting voltage values from the shunt) - so I can see coach battery bank current flow at all times. I've never seen the coach battery bank's charging current make a sudden step-function change, as it probably would if a fuse inline from the alternator opened.