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Hi and thank you for your question.
Was the ski flipped upside down in salt water?
Did the hull get a lot of water in it as a result of flipping over?
How much time, in days, weeks or months elapsed between the time it flipped over and you replacing the Multi function meter?
Have you checked the battery for condition and load capacity since the ski flipped?
Thank you for the additional information.
At this point, a voltage drop test is in order. Put your DCV meter across the battery terminals and hit the starter button. Let me know what the voltage is before and after hitting the starter button and we can go from there.
Since the voltage is not dropping very much, there is an issue with the starter circuit. It should be drawing more amps than that and shows as more of a voltage drop. I suggest checking to see what the voltage is on the starter wire side of the starter relay to see if it is functioning properly. This is starting to sound like a bad ground circuit.
Beautiful pictures. :)
What we are looking for however is putting your (+) lead of your meter on the red heavy cable leaving the starter relay going to the starter motor, and the black ( - ) lead of your meter on the negative terminal of the battery. The black wires are ground, and testing the ground side of coils is not relative to the starter motor function.
You should not have any voltage on the red cable going to the starter motor until you press the start button. Then is when you want to get your meter reading. I suspect you are going to see zero volts though.
OK, it sounds like your starter relay has failed. You should get pretty close to battery voltage through the starter relay. Unless those same red cables get hot when you hold the starter button, it is not allowing enough current to flow through it to energize the starter motor. You will need to replace the starter relay. If you want to make sure nothing else is wrong, you can jump across those two terminals on the relay and the starter motor should crank.
I am glad we correctly diagnosed and repaired your original problem. Now for the next problem. Banging inside the engine. Obviously this is not good. Since I can't hear it, the safest thing I can recommend is to remove the cylinder head and inspect the pistons and check to see if there is any up and down play in the rod. You can crank the engine over with the head off if you need to. Once you determine the source of the noise I can help you decide a course of action from there.
As far as the water temp gauge not working, typically it is a sensor issue, but that takes a back seat to a banging engine.
Is there any more information you would need from me at this time?
Based on the fact that it makes less noise out of the water would indicate an impeller/pump issue as opposed to an engine issue. Perhaps the ski got flipped over to try and get something out that was stuck in the pump.
It sounds like the impeller is beyond saving, from what you described. I would suggest pulling the pump out and getting a good close look at the impeller and housing. Check to make sure the prop shaft itself did not get bent also.
If you have any more questions, feel free to ask.
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