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Old 03-09-2009, 09:41 PM   #11
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Default RE: Short?

Lightly press the trim switch on the control and see if it hangs up. Then try the switch on the cowling. Could be a weak spring in one of the switches. Could be a relay but my money would be on a switch. Could also been water in a connector, but Yamaha's are sealed pretty good.
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Old 03-10-2009, 10:42 AM   #12
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Default RE: Short?

Hada similarthing happen to me. Was underway and the starboard engine starts trimming up uncommanded. Pressed the starboard trim switch on the binnacle and the trim action stopped. Thought it was an isolated incident but after another trip we were cleaning the boat and the same happened again. Boat was still under warranty at the time so took it to the dealer with a discrepancy of "starboard engine trims up un-commanded" the corrective action from the dealer was "lubed binnacle trim switch"3.5 years later (and out of warranty) trim switch did not work at all. I was a bit suspect of the corrective action at the time of initial repair but since it worked I overlooked it....basically their corrective action of lubing a "sealed" switch resulted in complete failure(disentagration)of the switch later down the road. I called the dealer and explained what happened and was given a new switch at cost $39. Not a bad deal out of warranty IMO, took me about 15 minutes to R2 the switch. Moral of the story...don't accept a dealer corrective action of "lubed switch" on a sealed assy.:doh

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Old 03-10-2009, 06:55 PM   #13
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I have a 225 Yamaha which I had rebuilt last year. And the Mechanic told me that Yamahas are known to have this problem. One good thing is you got it stoped. If not it would have burnt your tilt motor. This mechanic is knowledgeabl and a great marine mechanic. I have my boat at Sherman cove and I live in Crestview. One time I left the bateries on and thinking of this I went bach to Sherman Cover in the middle of the night to avoid any problems.

Mr. Day,my mechanic did not tell me what you should or if it will happen again. I just replaced my tilt motor. If you go to ebay you can get one for $160.00. If you buy it from a dealer it will run around $230.00. Good luck with this:usaflag
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Old 03-25-2009, 01:24 PM   #14
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Default RE: Short?

I just had to replace my trim motor on my 140 Johnson because it did that.

I was on the water when it went up all by it's self.

It burnt the motor before I could do anything. :banghead
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Old 03-25-2009, 02:52 PM   #15
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Default RE: Short?

I also had that happen on my old bass boat with a 50 Mercury. It was the switch on the motor. It was going to cost me more than it was worth so I just unplugged it and used the switch on the throttle.
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Old 03-25-2009, 04:13 PM   #16
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Default RE: Short?

Ihad it happen to me on a 150 Johnson and also a 25 Suzuki...both times it was the relays for the tilt trim. Don't know about the Yammy's yet (knock on wood). Hope you get it figured out. Good luck.
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