The B model has had no reported failures in the control unit since it was launched two years ago. With this unit it’s all about the gear selector switch . Battery power is fed directly to the selector switch. Power is sent to the correct solenoids by the switch. This unit has no circuit board. It is highly recommended to place a 2 Amp inline fuse on the battery feed of the unit. There is no short protection in this unit .
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A shutdown circuit can be added.