Update: I ran boat at night. Did not see any wires arcing against block. I did have the old 50amp fuse with yellow flag, I bypassed that and nothing changed.
It now seems like I have an intermittent high pitched slapping/firecracker popping even at very high rpms. It reminds me of the sound my...
Thank you. I will check this out. Funny thing is I did have a new alternator put on. I bought the boat and had delivered. Never ran it personally before i had it serviced. Took it to shop and they made all the repairs above. So I can't compare before and after.
2009 Harris Grand Mariner 250 SEL Tritoon
Mercruiser 350 MAG MPI Bravo III
serial: 1A335811
300 hours
Engine misses/hiccups only in a certain RPM range around 3000 to 3500. At idle and higher throttle it seems to run fine. It only misses or hiccups in that middle power range on throttling up...
