Help with motor please!

[jcaceem]

I have a 90 hp 1999 Mercury Force that has been basically trouble free for the last 8 years (since I bought my boat). A few weekends ago it would not start--no spark.

Doing some research it seemed like it was either the switchbox or the stator. I ordered both. Replaced the switchbox but not the stator and it fired right up.

Went out today and by the end of the day it would not start. Same problem. It has new spark plugs but there is not power to the plugs.

When checked, there is power to the switchbox. Could it be the switchbox again? This one did not come with a ground wire so not sure if it went out or I bought a dud. It is from CDI electronics.

I don't live at the coast but took this entire week off to fish with my family and after day 1 we have no working motor. Would really like to have an answer so we can salvage the week and fish if anyone has any ideas to help get us back on the water before Friday.

Thank you!

[rglide09]

Replace the stator


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[jcaceem]

I should also mention that the original voltage regulator has 4 wires (grey, red, and 2 yellow) with one black ground wire.

All the replacements, including the one I bought, have two red wires, a grey wire, two yellow, and no ground.

[Ronnie Redwing]

Check your emergency kill switch if you have an intermittent spark issue, as well as the other items you mentioned

[jcaceem]

Originally Posted by Ronnie Redwing

Check your emergency kill switch if you have an intermittent spark issue, as well as the other items you mentioned

The kill switch has never been tripped/toggled since I've owned the boat. Would there be any reason it would act up?

[Ronnie Redwing]

Yes, it could have internal issues that can prevent the ignition system from functioning Thatis it’s purpose! In case you get ejected from the boat. It stops the xspark and kills the motor. Thus the common name
“ Kill Switch.

[Ronnie Redwing]

You might flip that switch ooff an on about 20 times, then see if that changes your no start situation. It may have internal corrosion causing you problems. That switch has to work, by the way. New law last september

[HoustonTexas]

in order - kill switch neutral switch -- ignition switch

[Ronnie Redwing]

if your engine will spin over when you crank the key, its not the neutral switch

[Rockfish2]

Check the starter solenoid, I had a similar issue last year and that solenoid was going out which caused intermittent starting issues.