On my 2000 Magna there is an isolation relay located in the last compartment on the passenger side. It ties the chassis battery to the house battery when the oil pressure reaches 15 psi to charge the house batteries while the engine is running. It is also used as the "boost" relay when you need house batteries to start the engine. If I remember correctly it was a 200 amp relay. I don't have the part number but when I get home in a couple of days I can look it up if you want. It is a White-Rodgers relay.
My dash gauge also reads low when compared to the actual battery voltage.
Frank
Thanks Frank I would appreciate the part number.
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1997 Magna, gillig chassis , 38Ft.
Detroit 40 W Turbo 330 HP
Allison 6 Spd
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