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GTB 10 Status Light is Not On
For normal operation, the status light on the OnDeck™ hub should be flashing green. If the status light is not on at all, this indicates the device is off or in standby mode. In order to be in a "full power" mode, the GTB 10 will need to receive a signal either from the shore power sensor, or the "boat in use" (sometimes referred to as the "ignition wake") wire.
Consult the GTB 10 installation manual for instructions on how to install the shore power sensor and boat-in-use / ignition wake wires.