1974 25HP Evinrude won't turn off

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Rustymooney

Recruit
Joined
Sep 8, 2003
Messages
2
I recently purchased a boat with a 1974 25HP Evinrude O/B motor. The previous owner had replaced the ignition switch (on the dash) because the motor would no longer turn off. The new switch did not solve the problem. When I purchased the boat, I also replaced the switch with one that my OMC dealer recommended, and wired accordingly. The motor still will not turn off. Any suggestions?
 
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bayourat

Cadet
Joined
May 18, 2003
Messages
11
Re: 1974 25HP Evinrude won't turn off

i had a 96' 25hp johnson do that and i lost a ground on the coils so the kill switch would not send the fire to ground. you probably have a broken wire somewhere either in the ignition or your kill switch
 
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Rustymooney

Recruit
Joined
Sep 8, 2003
Messages
2
Re: 1974 25HP Evinrude won't turn off

Thanks for the info. That is where I was going to check next.
 
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TimW

Seaman Apprentice
Joined
Aug 17, 2003
Messages
35
Re: 1974 25HP Evinrude won't turn off

Check your clymer manual if you have one. I recall reading last night about a diode or something can fail and cause the engine not to shut off with the key. If you can't find it, I'll look it up tonight and post back.<br /><br />The Clymer manuals are actually quite good and are available from iboats.com.
 
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TimW

Seaman Apprentice
Joined
Aug 17, 2003
Messages
35
Re: 1974 25HP Evinrude won't turn off

Not sure if this applies to your '74, but on the models with hydroelectric shift, Clymer says:<br /><br />
<br />A blocking diode is used at the front of the shift box to prevent current from reaching the gearcase whenever the ignition switch is off. If the diode fails in an open position, the engine will remain in forward gear until the stator output energiezes the shift control circuit. If it fails in a closed position, the engine cannot be shut off.
Click to expand...
I added the emphasis. Hope this helps.
 
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