It sounds like you may have more than one problem. Here's what I'd do it it was my boat.
1 - to isolate your 'no start' problem, get a 4 foot wire with couple alligator clips. Clip one the 12v pole on the battery and touch the other end to the 12v relay pole on the starter. Starter should spin. If it doesn't, you have a relay problem. If does, then the problem is upstream in the wiring and you'll just have to work backwards until you find the bad component. I tried to follow what did above but it wasn't clear to me....you need to put 12v on the switch side of the relay to test it.
2 - you said when the starter spins, it's not engaging (ie - cranking the engine over). This is either a problem with starter or the ring gear. If you can, use a socket and breaker bar to roll the engine 30 degrees or so to get a new spot on the flywheel...try cranking again. If this time it goes, you have a chipped ring gear. If it still spins but doesn't engage, you should pull the starter and inspect the engagement mechanism...you'll likely need a new starter.
1 - to isolate your 'no start' problem, get a 4 foot wire with couple alligator clips. Clip one the 12v pole on the battery and touch the other end to the 12v relay pole on the starter. Starter should spin. If it doesn't, you have a relay problem. If does, then the problem is upstream in the wiring and you'll just have to work backwards until you find the bad component. I tried to follow what did above but it wasn't clear to me....you need to put 12v on the switch side of the relay to test it.
2 - you said when the starter spins, it's not engaging (ie - cranking the engine over). This is either a problem with starter or the ring gear. If you can, use a socket and breaker bar to roll the engine 30 degrees or so to get a new spot on the flywheel...try cranking again. If this time it goes, you have a chipped ring gear. If it still spins but doesn't engage, you should pull the starter and inspect the engagement mechanism...you'll likely need a new starter.
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