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Motor trimming up by itself

Old 01-24-2019, 10:03 AM
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Default Motor trimming up by itself

Hello,

I am a first time boat owner and have had my bass tracker txw 175 for about 6 months now. It has a 50 hp mercury 2 stroke engine.

Last night it was pouring down rain, I have my boat in the driveway with a cover on the boat and motor (no garage or standalone garage to keep it under). But at about 1 am the motor was trimming up by itself and it freaked me out, because if I was going to have a problem with the boat I assumed it would have been on the water. The motor would trim up every 20 minutes or so and cut off after ~1 minute. I ended up disconnecting the negative battery cables.

But I've been reading that the switch is bad for the trim pump and my question is, how can I tell which switch it is, because I have 3 (one on the motor itself, one on throttle, and one on bow next to trolling motor). Is there a way to test each or will have I to replace one at a time?
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Old 01-24-2019, 10:15 AM
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its typically the one on the motor. start looking for corrosion / and you will need to either unplug a switch while it is happening to figure it out, or try to test a switch with a multi-meter. Problem is that it may be intermittent or when it gets wet. So the multi-meter might not show a problem.

I would start by replacing the motor switch, and maybe you can test them side by side prior to installing to see if you see a "short"
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Old 01-24-2019, 10:18 AM
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One of the reasons most boat owners opt for a battery disconnect switch is to avoid any no operational battery draw.
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Old 01-24-2019, 10:26 AM
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One of them has water in it. Start with the non oem switch on the bow.
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Old 01-24-2019, 10:29 AM
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Originally Posted by mitchell master View Post
One of them has water in it. Start with the non oem switch on the bow.

^^ This - The switch on the motor would be 2nd in my opinion but it SHOULD have a water tight housing.
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Old 01-24-2019, 10:30 AM
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Thanks for the replies. Dumb question, would getting water out of a switch cause it to function properly again?
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Old 01-24-2019, 10:36 AM
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Originally Posted by mfoley312 View Post
Thanks for the replies. Dumb question, would getting water out of a switch cause it to function properly again?
Possibly. However once the switch is full of water, don't be surprised if it starts to rust and the same issue happens while you're using the boat...I'd replace it. I had that issue on my boat and replaced it for peace of mind.
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Old 01-24-2019, 10:38 AM
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Originally Posted by jj1987 View Post
Possibly. However once the switch is full of water, don't be surprised if it starts to rust and the same issue happens while you're using the boat...I'd replace it. I had that issue on my boat and replaced it for peace of mind.
Makes sense, thanks!
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Old 01-24-2019, 10:52 AM
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It going to be hard to test unless your can duplicate the problem. I had an issue with my trim but on the throttle wires. Over the years from their movement (my switch is on the actual throttle not the body of the throttle) they had worn the covering off. The wires would touch causing the motor to trim down.
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Old 01-24-2019, 10:55 AM
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When my engine did this it was the relay.
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Old 01-24-2019, 12:06 PM
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Happened to me on the water one day, it was the switch on the motor. I was able to get in holding the down button on the throttle, which kept it from moving.
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Old 01-24-2019, 12:33 PM
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I’ve had trouble with the switches on the motors a couple of times. I unhook them. Just don’t want to have trouble out on the water.
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Old 01-24-2019, 01:04 PM
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I would check the trim switch and wiring on the remote control throttle. I've seen wires get frayed and tough together right were thy bend around the bottom of the throttle lever. Did exactly as you described.
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Old 01-24-2019, 02:50 PM
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FOUND THE PROBLEM!!!!!!!
There was a single drop of water on the connectors for the switch near the trolling motor. After checking all 3 switches, they all looked normal except for that drop of water.
Plugged the batteries back up and within 10 minutes the tilt motor started rising up. I didn't see it the first time but I waited outside for it to happen, unplugged the red connector for the switch on the bow and it stopped. Guess I found the problem.

Now, going off of that; do I need to replace the switch, or the wires as well. The wires look hidden in a plastic tubing, does that all get replaced too?
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Old 01-27-2019, 09:47 AM
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Originally Posted by mfoley312 View Post
FOUND THE PROBLEM!!!!!!!
There was a single drop of water on the connectors for the switch near the trolling motor. After checking all 3 switches, they all looked normal except for that drop of water.
Plugged the batteries back up and within 10 minutes the tilt motor started rising up. I didn't see it the first time but I waited outside for it to happen, unplugged the red connector for the switch on the bow and it stopped. Guess I found the problem.

Now, going off of that; do I need to replace the switch, or the wires as well. The wires look hidden in a plastic tubing, does that all get replaced too?
Mitchell Master for the win!
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Old 01-27-2019, 09:54 AM
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Originally Posted by mfoley312 View Post
FOUND THE PROBLEM!!!!!!!
There was a single drop of water on the connectors for the switch near the trolling motor. After checking all 3 switches, they all looked normal except for that drop of water.
Plugged the batteries back up and within 10 minutes the tilt motor started rising up. I didn't see it the first time but I waited outside for it to happen, unplugged the red connector for the switch on the bow and it stopped. Guess I found the problem.

Now, going off of that; do I need to replace the switch, or the wires as well. The wires look hidden in a plastic tubing, does that all get replaced too?
Unless the wires are showing signs of corrosion, I'd leave them be.
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Old 04-11-2019, 02:37 PM
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Thanks!
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Old 04-11-2019, 03:32 PM
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Happened to me a few weeks ago, it was the switch on the throttle
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