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I have a new boat with twin f200 xca engines and the command link Plus display. How do I get the house battery voltage to display on the command link Plus? I have a total of four batteries two for starting and two house batteries. The starting batteries or hook to the main battery cables from the engine and each of the house batteries are hooked to the auxilary charging leads from each engine. I am under the impression that the house battery voltage display is registered at the auxiliary charging leads but mine does not display any voltage. If I use a voltmeter I do have voltage at both ends of the lead and also the house batteries are charging when the engines are running.