I'm former ASE certified brakes and electrical, former USMC motor transport mechanic and Maintenance Management Officer. Graduated top of class Sacramento College Auto ROP course.
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Originally Posted by flattracker
I agree. Charge the batteries first. I ended up with a fried alternator on my fire truck.
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100% correct....
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Originally Posted by flattracker
Alternators are not "battery chargers" ......
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Again, 100% correct. Charging a battery or batteries for these big diesels rather than replacing starting energy and providing ongoing needs will burn out an alternator.
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Originally Posted by flattracker
A suggestion: get a small 20 watt solar charger that plugs into the cigarette lighter receptacle, plug it in and face it towards the south. the batteries will stay peaked up, even in the winter.
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This is a viable solution but be sure that you plug it in to a lighter/power socket that is powered (i.e. connected to the battery) when the ignition is off. Many buses have solenoids that shut down electrical items when the ignition is off. I'm surprised yours doesn't.
Long term, installing a battery master switch at the battery box to isolate the batteries from the electrical system is another solution though it would require accessing the batteries to operate the switch.
Another option, install a solenoid in the offending circuit that only allows juice when the ignition is on.
The small maintenance panel is the better idea for those who are not comfortable and knowledgeable with circuitry as it solves the problem without introducing new potential problems. And, if the power socket isn't hot when the ignition is off, it's a very simple matter to add a constant hot socket or hardwire the small maintenance solar panel.