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Lewmar Bow Truster Issues

Old 09-15-2018, 10:44 AM
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Default Lewmar Bow Truster Issues

I have a Lewmar bow thruster that is acting strange.

It works fine for a few seconds and will shut off. The lights at the joy stick will go out and at the main power switch.

There is a power switch (is lit when on), which I assume is attached to a relay, then the main power is fused near the thruster itself. The 100amp fuse is not blown.

If if I toggle the switch a few times it starts working again. But it acts the same way.

Where start trouble shooting?

Replace the switch?
Old 09-15-2018, 11:27 AM
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A friend of mine was having a kind of similar problem
Ended up being the installer wired the motor wrong.
Old 09-15-2018, 11:33 AM
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Does it have an internal thermal breaker?
Old 09-15-2018, 11:48 AM
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Originally Posted by mfix View Post
A friend of mine was having a kind of similar problem
Ended up being the installer wired the motor wrong.
I guess that’s possible, but the issue just started. The boat is 3 years old.
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Old 09-15-2018, 11:49 AM
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Originally Posted by airbrush View Post
Does it have an internal thermal breaker?
I’m not sure. I’ll have to check the manual
Old 09-15-2018, 01:18 PM
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I had the exact same issue on a 4 year old unit. Called Lewmar tech service. They walked me through a trouble shoot, basically you pop off the switch at the canon plug and jump the wires. If the thruster comes on it is the switch. It was on mine, they sent me a brand new one no questions asked, no charge.
Old 09-15-2018, 05:32 PM
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I would start by checking what is happening to the voltage at the main contactor unit. Use a meter to check if the voltage is still leaving the contactors when the motor stops. If so if could be the thermal cutout or faulty motor etc. If it is a bad switch or bad battery cable/connection etc you will likely see the contactor disengage and the voltage at the output to the motor will go to 0V. If the voltage to the motor does drop to 0V then I would check if the voltage on the main battery feeds is still there at the contactor. That will show if the contactor is failing or the battery or battery feeds are an issue. 30 mins with a 2nd person and a voltmeter and you should have it mostly isolated.
Old 09-15-2018, 06:50 PM
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Originally Posted by PapaG399 View Post
I had the exact same issue on a 4 year old unit. Called Lewmar tech service. They walked me through a trouble shoot, basically you pop off the switch at the canon plug and jump the wires. If the thruster comes on it is the switch. It was on mine, they sent me a brand new one no questions asked, no charge.
I’m sorry, I’m not sure what you mean by “canon plug” can you elaborate?
Old 09-16-2018, 06:11 AM
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Remove the control switch from the helm. 6 inches or so under it, at least on mine, was a canon plug. Four wires, I believe. In other words, it's where the control switch plugs into the boat's grid.

I got the feeling talking to Lewmar that they had seen this before.
Old 02-13-2020, 02:15 PM
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They've seen it before - All you have to do is google and learn that this has happened quite a few times in the last few years. I had issues with mine as well. And of course on the one occasion that I left the main battery cut-off switch to the Thruster on, it started in the middle of the night and ran on its own. The culprit seems to be in the joystick. I bought my entire unit in early 2018 and it's only been on the boat about 18 months. Lewmar now has what they call Gen 2 compliant joystick, control cable and a blue box converter which I'm told is being processed and will soon be shipped. BTW... no one from Lewmar ever contacted me about this issue and the changes they've made as a result, and I'm registered w them re warranty, etc.
Old 02-13-2020, 03:38 PM
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Lewmar support has been good to me in the past, why not give them a shout?

Thruster issues usually fall into a few buckets: loose/bad connection, bad battery, thruster fried, or joystick broken
Old 02-13-2020, 04:40 PM
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Lewmar support is excellent.
Old 02-13-2020, 05:14 PM
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I didn't realize this thread is that old, but just to add to it Incase others have the problem, I also have a lewmar thruster and the same thing happened. Joystick ending up being the issue and replaced with a new one from Walmart with a 4yr extended warranty lol. Hope it blows again before the warranty is done.
Old 02-14-2020, 06:29 AM
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Since I purchased the boat, I have replaced just about every part of the bow thruster twice.

It is what it is.
Old 02-14-2020, 07:20 AM
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Originally Posted by JaxBch View Post
Since I purchased the boat, I have replaced just about every part of the bow thruster twice.

It is what it is.
I I do have a question for you Maybe you could help. I've only had the boat 3 years and I've noticed that the "thrust" seems to be a bit lower than when I first purchased the boat. Since you've changed everything on your Lamar thruster over the years any idea what may be causing this in particular? I've already replaced the battery because I tested it with a digital tester and it showed the CCA's were almost half of what they originally were. I did get a slight increase in thrust after replacing with a newer and more powerful battery. But again nothing near what it was when I first purchased the both 3 years ago.

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