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Trim Switch Problem

terb

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I have offshore controls with the trim switch in the throttle and the switch seems to work intermittently.
It will trim down but not always up. Any ideas where to begin to look?
 

mjc

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Is that the only switch you have? If not how does the other work?
 

BigSteve

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I have offshore controls with the trim switch in the throttle and the switch seems to work intermittently.
It will trim down but not always up. Any ideas where to begin to look?
The switch goes to a pair of trim pump relays from there to the pump motor.

Relays can and do fail I keep one in my boat tool box.

I would try replacing the trim relays

A volt and amp meter can help you solve your problem.

Start at the power connections make sure all connections are clean and tight at the battery then at the trim pump and relays. Trim switch will generally have three wires a red or purple hot going to the switch and two output wires the blue wire for up and a green wire for down.

I use a amp meter in the circuit to test for excessive trim motor current draw, from a bad motor that can overload and ruin the power relay

Intermittent problems can be a real bitch, I have hooked up extra jumper wires and a couple test lamps. To find signal problems that fail under operating conditions.
 

terb

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The switch goes to a pair of trim pump relays from there to the pump motor.

Relays can and do fail I keep one in my boat tool box.

I would try replacing the trim relays

A volt and amp meter can help you solve your problem.

Start at the power connections make sure all connections are clean and tight at the battery then at the trim pump and relays. Trim switch will generally have three wires a red or purple hot going to the switch and two output wires the blue wire for up and a green wire for down.

I use a amp meter in the circuit to test for excessive trim motor current draw, from a bad motor that can overload and ruin the power relay

Intermittent problems can be a real bitch, I have hooked up extra jumper wires and a couple test lamps. To find signal problems that fail under operating conditions.
Thank you, I will check the connections and go from there.
 

t&y

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At least I'm not the only one with wiring issues:D
 

BigSteve

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Thank you, I will check the connections and go from there.
I took a pic of a Mercury remote trim pump relays and loom

Your pump may have the relays mounted to the pump, same wiring as the outboard different loom
 

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ka0tyk

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def test with a voltmeter. if you DO replace make sure you get legit bosch relay replacements, not vatozone junk.
 

572ext

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Does it work all the time with the trailer up switch? If so you could have a problem with the trim limit switch. The trim limit switch is on the gimbal ring starboard side.
 

BDMar

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Mercruiser trim pumps do not have relays from the factory. There are 2 solenoids, (1) for up and (1) for down, on the trim pump that can fail. It is probably either the rocker switch in the throttle or the trim limit switch as 572ext mentioned.
 

terb

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Any idea how difficult it is to replace the rocker switch?
 
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