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Hello,

My 2000 206, Mercruiser 5.7 FI, Bravo 3 was running great all day. Sat for a few hours and wouldn't turn over with the key. Both batteries were hot and we were able to jump the solenoid and the key would then start the boat. Headed back to the dock whenever I tried to accelerate past 1/3 throttle the boat would bog down. When I quickly backed off the throttle the engine would idle normally.

My initial thoughts are starter solenoid but the throttle issue is confusing. That being said I'm not an electrical expert and both issues started at the same time.

Thoughts?

This sounds a bit like vapor lock, which is pretty rare these days. Not sure what that engine has for a fuel pump or the rest of the fuel delivery system, but I'd start looking there. Others who may have experienced something similar will hopefully chime in as well.

This could be fleas and ticks -- both a battery problem and a problem in the fuel delivery system.

"Both batteries were hot . . ." Literally hot to the touch or "hot" as in ready to use? If the former, they might have shorts or are getting overcharged.

Bogging down under load is usually a problem with the fuel delivery system.