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Yamaha 150 shuts off

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BlueSkyGuy

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Yamaha 150 shuts off

PostThu Jul 10, 2014 8:23 pm

never heard this one before, Yami 150, never any problems, engine was running and just shut off like the kill switch was pulled or key removed

trim won't work, engine won't turn over,totally dead, all other electric systems working fine, the engine fuses are OK

put batteries on charger, restarted the next day, used volt meter to watch batteries, alternator was working, tried each battery individually, wouldn't turn over on one of them, then nothing when using both batteries

put batteries on charger overnight, starts fine the next day, runs for awhile, tried various electrical components with engine running, all OK, turned on bilge pump, engine stops, trim won't work, all other electrical stuff works, bilge pump runs properly

other than the obvious - you have an electrical problem - thoughts?
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stevep84

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Re: Yamaha 150 shuts off

PostThu Jul 10, 2014 11:22 pm

Sounds very weird.

First check your earth terminals, if that doesn't sort it I hope someone else can help. 8)

Steve
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scmedic84

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Re: Yamaha 150 shuts off

PostFri Jul 11, 2014 7:34 am

Yea I'd be willing to bet there's a terminal corroded somewhere causing a loose connection....
"The Wet Dream"
197 SF Suzuki 150 4-Stroke
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BlueSkyGuy

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Re: Yamaha 150 shuts off

PostSun Jul 13, 2014 8:50 am

I've got sparks jumping from the negative battery termination point on the engine, they jump when the trim/tilt operates and when the engine starts. Doesn't happen every time. Not good. Still investigating.
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BlueSkyGuy

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Re: Yamaha 150 shuts off

PostMon Jul 14, 2014 9:31 pm

have checked connections under the console, at the ignition switch and kill switch, all OK
all battery connections are good, batteries showing 12.7V, 13.2+V when engine is idling
all connections under the cowling are good, don't see any corrosion, fuses and relays are good
didn't inspect the trim/tilt relay
spark jumps between the negative cable termination stud to nearby points including the starter, another wire termination post and back towards the front of the engine

there must be a bare, skinned or whatever wire or exposed electrical component that is inducing positive voltage on the skin of the block sufficient to cause an arc, I moved a bunch of wires around trying to feel for skinned or melted spots, suspect whatever was causing the problem is now far enough away from the block that the arc isn't happening, engine ran for 10-12 minutes without issue, waiting on info from mechanic and maybe Yami

quite an interesting but aggravating mystery
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BlueSkyGuy

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Re: Yamaha 150 shuts off

PostThu Aug 14, 2014 10:11 pm

mechanic says he has seen this a couple times - find the lose connection

the engine ground bolt seemed tight, removed the bolt, the back of the spade terminal was slightly pitted all the way around and the post was slightly pitted, mechanic thinks that there was enough resistance there to make the ground weak, sanded everything and reinstalled, so far so good

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