The 12 volt receptacles in the front cap of the plant 750 coaches are powered through the Ford fuse center and the chassis battery beside the engine. Unless you have an inverter with a remote monitor, you cannot check the house batteries without separate battery monitor. You can use a cheap HF VOM to check the house batteries or you can buy a volt meter (e bay and Amazon have hundreds ) and wire it into the coach thermostat's hot wire (black) to check the chassis batteries.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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