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I am looking for a location to install the house battery. Appear that the aux battery compartment under the driver seat will fit (I don't have aux battery option). Can someone with aux battery package confirm that the nut where the white cable is connected to is the proper ground for the house battery (picture attached)?

Thanks!
 

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Any of the nuts connected to the chassis should be ok. You can measure the voltage between battery positive and the nut. If it is 12 volts or so, it is a ground for the Metris battery.
 

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Since the battery ground is not fused, the cable and attachment point MUST be heavy enough to carry the current supplied by ALL the circuits from the +ve terminal. If not, it can overheat and start a fire.
 

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