Usually a voltage divider type sender should be around 10k ohms. I've not measured one on a MerCruiser though. (Maybe something I should do)...
Was going to suggest that... You also have another sender on the other side, no?
🤷 It was a pretty big arrow.
All good. Did go through the chart already. No spark on coil lead. Not sure I am doing it correctly. Waiting on a spark gap tester. Been using an old plug
An old plug will work fine.
1. Just that it moves smoothly. I wouldn't replace it until I had a shifting problem or obvious water ingress.
2. Yes. Check alignment as well
3. Check your timing and set your idle mixture as well
So you get a faulty reading. Pcm sends out a separate 5v reference for each sensor (unless Merc is doing something "special"). Not seeing why that would impact the voltage in the rest of the system, or why the PCM thinks it's being supplied with a low battery/charging voltage.
Removed the starter and found the other end of the shift shaft. Not much there to go wrong. Confirmed that there's no resistance at that point. Disconnecting the linkage and it shifts easily when I put a wrench on the shaft. Noticed that both my throttle cable and shift cable when disconnected...
Pretty sure that's the issue on mine... Like the coil, everything can break. But there's a spec for checking the slop in the intermediate shift shaft, so easy to rule out a drive problem.
Ok ...
No such thing as cleaning the carb from the outside. 99/100x your problem is fuel delivery. Have you checked/cleaned filters? How old is the gas? Do you have a fuel/water separating canister filter (highly recommend to add one if not). The stains in the water and rough idle sound like...
Follow the chart, let us know where it breaks down. It's not a complicated system, an ignition module failure is really the only thing that *might* make it worthwhile to change systems. Relatively rare, easily found on eBay.
