Motor just quit starting

allenx1966

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Joined
Sep 28, 2007
Messages
18
i have a 1978 85 hp no power trim Evinrude. i have owned this for a year now and love it. when i first got it, it ran rough, but after tracking down a pinhole fuel leak on the fuel lines and replacing it,it ran just fine until today.

on the last day of my vacation, (at least it was the last day,not the first) i stopped the boat on the way into the marina to bring in the tube after successfully having made my son wipe out several times on the tube. I then tried to restart it, but there was nothing,not a sound at all when turning the key.
i started with what little mechanical knowledge i had to track down the problem. checked the battery charge, it was fine. checked other electrical items , fish finder,lights, and they were fine. took off motor cover, pushed the key in to see if the choke would respond, nothing. so with my best guess, i am assuming that there is a broken wire or corroded wire or connection between the key switch and the starter solenoid. i used an old trick i used to use for cars, i turned the key to "run" position and then i used a pair of pliers to jump the post on the solenoid. that worked great,and she fired right up and ran normal. after getting back to the boat ramp,i tried to shut it off and start it again,and just as before , nothing.
im no expert, but im thinking since my electric choke and starter are both not working at all when i turn the key, it must be a ground wire somewhere, otherwise either my choke or starter would work. so with this in mind, and assuming i am correct about it being a ground wire,can anyone suggest where i might start to look for the break in the ground?
thanks allenx1966
 

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: Motor just quit starting

The probable cause is a blown fuse in the fuse holder just off the large post battery end of the starter solenoid. It is a 20amp glass fuse that protects the positive lead through the wiring harness to the ignition switch. The power is then routed back to the small post on the solenoid when you turn the key to start.

The same wire/fuse provides positive voltage for the choke solenoid.

Both solenoids are hard wired to the engine block for a ground.

If the fuse is OK, check the Big red plug at the engine for corrosion.

Ignition switch going bad could have caused the fuse to blow, or an overload on the accessories post on the ignition switch.
 

allenx1966

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Joined
Sep 28, 2007
Messages
18
Re: Motor just quit starting

would that fuse also make the electric choke stop as well? choke gets is positive power via the same fuse? thanks for the tip and the email error, i think i edited it correctly.
 

allenx1966

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Sep 28, 2007
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Re: Motor just quit starting

ok, i looked for the fuse, only thing i saw was a white round plastic piece just after the positive post on solenoid. it appears to just be part of the rubber boot covering the post. it turns freely with the boot. i pulled apart that red plug, it looks fine,like it just came from the factory. im hoping the person that owned this before me did not remove the fuse and hard wire it. it all looks factory fresh though. i did notice a few days ago, my keys switch was a bit loose, and i hand tightened the big nut that holds it in place. think that may be a good place to start or maybe under the back of the boat around transom to locate fuse? i really dont like all the old wiring between the motor and control box, it has been re-done before by what looks like a rookie. think it may be a good idea to go ahead and just replace all the wires and cables between control and motor? do they make a pre-fab harness for that ,or do i actually have to run each wire individually? thanks for the help, i really appreciate this
 

nuttyboater

Petty Officer 3rd Class
Joined
Jun 26, 2008
Messages
81
Re: Motor just quit starting

Do you have a fuse holder behind the ignition switch at that end of the harness? My 68 has a fuse holder there that supplies power to the keyswitch and the choke switch, mine has a seperate toggle switch for the choke whereas yours is built into the ignition switch.

Take a voltmeter and make sure you have power at the ignition switch. If jumping it at the solenoid works, been there done that before, then its just a problem up front most likely.
 

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: Motor just quit starting

:)You cannot survive in the desert by reading a book on water.

Look at the solenoid for the smaller red wire off the large post on the end farthest from the starter. Pull the two parts of the fuse holder apart and see if the metal has broken in the fuse.
 

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allenx1966

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Sep 28, 2007
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Re: Motor just quit starting

ezeke , you were close. i found a fuse,but not right off the solenoid. it was way past it in the middle of a bunch of other wires. sure enough, it was blown and it is a 20 amp. its a glass fuse like you said, but its 5/8 inches long. looks like a hard one to find at the store. would it be better to splice in a more readily available fuse type?
so think this is a symptom of a short somewhere else? think it would be ok to just replace it ever so often until it just starts blowing constantly? i wont be able to test it today.
 

allenx1966

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Joined
Sep 28, 2007
Messages
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Re: Motor just quit starting

ezeke , i stand corrected. you were not just close, you were right on the money ! after looking closer, the red wire was covered with black heat shrink and then taped to another harness with black tape. looks like they just did that to keep it snug from bouncing. but sure enough, you were right on the money! YOU ROCK!
you saved me soooooo many cuss words..

THANKS A MILLION !!!! my wife says thanks too... she hates hearing me swear.... : )
 
Joined
Jul 21, 2008
Messages
1
Re: Motor just quit starting

My 35hp 1978 Evinrude also will not start. I had the same problem that began this thread; however, I have gone through and checked all the fuses. They are all fine. I removed and had the starter checked - it is fine, too. I charged the battery. I checked both sides of the solenoid with the key on and at the start position. I have power there. I even attempted to jump the solenoid but it would not turn over.

Any other ideas?
 
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