1991 mercury starting issue

[brad1990]

Hey legends , I have a 1991 100hp mercury, when you first hit the key it cranks over fine until it gets to the point where it's about to fire up and then starts cranking really slowly like there's resistance , was just wondering if this could be a corroded earth wire to the starter itself.. thanks legends

 

[airshot]

First thing is to have your battery tested, even newer batteries can go bad. If battery checks out, then clean all connections until brite and shinny !
After that check the starter !

 

[racerone]

Checked the flywheel key ?----Did this issue develop[ suddenly?

 

[brad1990]

First thing is to have your battery tested, even newer batteries can go bad. If battery checks out, then clean all connections until brite and shinny !















After that check the starter !















Checked the flywheel key ?----Did this issue develop[ suddenly?
Hey mate! Thankyou for the reply , my brother previously owned the boat, had fair bit of money spend on engine and was running sweet but had been sitting for about 3 yrs when I brought it and problem accured






Checked the flywheel key ?----Did this issue develop[ suddenly?

 

[brad1990]

Hey bud, thanks for the reply , my brother previously owned the boat and was running sweet , but has sat for 3 yrs , im all new to the outboard scene. Have had numerous battery's in it for same result. And replaced the starter , maybe corroded earth wires to the starter ?

 

[Chris1956]

It does sound like corroded battery cables. They can corrode even under the insulation. Look for bulges in the cale along it entire length.

Make sure the ground cables are good as well.