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Old 06-15-2009, 06:56 PM   #1
Junior Member
Join Date: May 2009
Posts: 11
Question Battery boost switch didn't work

I had a dead main battery and tried to use the boost switch to start the coach and it would not work. The main battery is a 12 volt and the other batteries are 2 6 volts. How and what would i need to do to trouble shoot why this happened and how to get it to work correctly next time. I now have a blade type disconnect on the coach battery and will use it as soon as I get to my camping spot,(hopefully I remember).

1990 National Dolphin Class A 3400 ford 460
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Old 06-16-2009, 10:42 AM   #2
Join Date: Jan 2008
Location: San Antonio, Texas
Posts: 41
Having encountered this same problem on my '99 Tropical (F-53 chasis), I have two questions. When you press the "boost" switch, do you hear a solenoid click? If not, check that your house batteries are holding a good charge.
I had a bad chasis battery and one of my 6 volt house batteries also had a bad cell. When I hit the boost switch there was not sufficient voltage to activate it. I was able to start my generator (barely). I let the generator run for a couple of minutes, and with the generator running, attempted the boost switch again. This provided sufficient voltage to activate the solenoid, and I was able to start the engine.
This worked to get me about 300 miles to get to a stopping place where I could order the batteries and get them replaced.

Of course it could be something in the switch, but I would check the batteries, and try this first.
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