In many cases the battery disconnect switch is a latching type relay. When switched on it stays on after the switching power is removed and vice versa. There are two switching terminals on this type of relay with plus on one terminal and negative on the other it will switch on. When the polarity is reversed it will switch off.
Franco
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Gimpy
Franco Filipovic
2001 Newell Coach
Detroit Series 60 HP 500
Allison 6 Speed HD4060
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