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Old 16 April 2019, 10:57   #1
Country: UK - England
Town: Hampshire
Boat name: Zodiac 550 Pro
Make: Zodiac
Length: 5m +
Engine: Mariner 80hp
Join Date: Jul 2018
Posts: 6
Mercury Quicksilver Throttle sticky trim

I came to get my support rib ready last week.
The battery was disconnected so I reconnected it to check the engine started under mufflers etc.
When I came back the engine had trimmed itself all the way up and the pump was still running. One click of down stopped it but it kept doing it randomly...
The rocker switch on the throttle is not stuck.
Any ideas on how to fix?

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Old 16 April 2019, 14:40   #2
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Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,744
Electrical gremlins!

Do the obvious and check the solenoids, especially the wiring to them, lightly sand connections and reattach.

Now it could be it's shorting itself. The wiring in most of these remote looms isn't tinned. You need a cheap multimeter to check continuity. Again, pull apart the bullet connectors, lightly sand and reattach.

Are there any relays on your engine? I'd also open the remote to take a closer look. They are notoriously fiddly, so don't do this outside. There are start in gear micro switches, etc. I'd want to check the wiring to the trim button, which no doubt will be a sealed unit. Any trapped wiring should also be investigated.
Is that with or without VAT?
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