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Old 28 August 2018, 07:00   #1
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Country: UK - England
Town: Darlington
Boat name: Duo-diver
Make: Avon SR5.4
Length: 5m +
Engine: Mariner 90hp
Join Date: Nov 2013
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Power tilt and trim fault

Hoping for a little help and guidance here!

Ok, the motor is a 2004 two stroke 90hp mariner with standard remotes.
The problem, well after a day of steady bimbling about the engine decided to trim itself....to the extent that it came out of the water of its own volition

If I pressed the 'down' part of the PTT rocker switch the engine stopped moving and there was no sound from the PTT unit.

Dropped the relay out and as you may expect the PTT unit did nothing

I swapped the wires about to get the motor down and limped home with the relay out.

So, what are thoughts, could it be the relay or a switch jammed? The engine has had a major rebuild so we weren't exceeding 3000rpm and not bashing about. No mechanical 'wallops' against the remote or engine in the area of the switches.

I have ordered a new relay just in case this is the route of my problem but would appreciate feedback from those who have more experience.

Thanks in anticipation
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Old 28 August 2018, 07:25   #2
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Country: UK - Scotland
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Boat name: breezy
Make: northcraft
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a short to live in the harness or a sticky relay would be my first point
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Old 28 August 2018, 11:35   #3
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Country: Other
Make: Avon Searider
Length: 4m +
Engine: Yamaha 50
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Try (using jump leads) supplying the trim motor directly with 12 volts. You should get movement up or down - if you don't the motor is shot. I've had two Yamaha trim motors go on different engines in the last couple of years. Good news is if it is that it's an easy fix - plenty of after market motors on ebay for about 10% of what Yamaha want for a branded one.
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