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Old 02-25-2012, 01:15 PM   #1
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Dead Chassis Battery

I have a '98 Dutchstar on a Ford F10 chasses. I left the underhood ligh on and drained the battey completely.

So I tried to use the battery boost switch on the dash to connect the house battery to the chassis and it was of no help.

My question is, can the battery boost be used to connect the house to the chassis only, or is it only for the chassis to the house?

That being said, any idea where to start looking to find a correction to this problem, and if it can be used both ways, so I do not get stuck again.

Thank you in advance.

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Old 02-25-2012, 01:31 PM   #2
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Check the battery voltages and water levels first. Maybe put an automotive charger on the chassis battery for a couple hours too.

The battery boost switch (aka 'Aux Start') is a momentary switch that operates a standard automotive solenoid. This device is bi-directional so it works both directions (when the Aux switch is closed). That solenoid is not designed for continuous duty however for testing you can jumper the coil wire directly to the house batteries (two 6V in series, usually, make sure you measure 12V or better where you connect it). If you hear it clack, but no voltage change, the solenoid might have bad contacts.

Note that some RV's have safety circuits that won't allow you to do much if the batteries are fully discharged...maybe yours shuts off the Aux start solenoid.
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Old 02-25-2012, 05:56 PM   #3
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Your Newmar coach switch should work both ways. That being said, there are several items to check before jumping into the switches and solenoids. The only problem I've had with this circuit has been the batteries themselves. Consider having the batteries at full charge and then stress test each battery. I know this is a PITA, but one might as well begin at the most vulnerable part in the list of things to check. If the batteries all stress test okay, then it's off to checking the other components in the circuit with a meter.
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battery, chassis

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