Hi there, a common problem ! Watch the selector rocker switch as you select gears (engine running) and see if it momentarily flicks the switch, it should not in any way hold it in for longer than a quick blip. if it is holding the switch too long this is more than likely an indication of a tight lower cable if this is the case it should be either greased up or replaced, it is quite possible if you have been using the boat without the interrupt working that the cable has kinked or stretched. As for the wiring of the interrupt. When I setup a boat with the repower marine delco est ignition which is what I assume you have, on the advance module (small black box in the distributor with two plugs) there is a pin on one connector to connect to for shift interrupt. on my mercruiser/repower marine setup the the interrupt switch is an open circuit when depressed where as from memory the delco ignition requires the switch to complete the circuit when depressed so after much head scratching mistakes and blown modules I wired the power of the coil Via a relay and the switch wire of the relay to the interrupt switch then to the ignition key meaning that ignition key on and shift in normal position activates the relay and provides ignition and when the interrupt blips it just cuts the power to the coil. it works well for me. however if your interrupt switch is a make when depressed then I think from memory this is supposed to ground the module through the interrupt wire (black from memory) hope I have helped Ed
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