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KDCr7

Replacing stepper motor on gauge

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KDCr7

So my speedo quit last summer, been through troubleshooting everything including paddle wheel. Narrowed it down to the stepper motor and figured its worth a shot at replacing. (going analog or PP not in the budget this year)

I have the gauge apart but cant get the circuit board out of the housing. Does the 5 pin connector need to be de-soldered for the board to be removed? 

The only info i could find was an old thread https://www.themalibucrew.com/index.php?/profile/23114-jasonrmorrow/. Sounds like the pins shouldnt come out.

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UWSkier

If you figure it out, please post some pics. I have a dead tach and a spare speedo that can serve as a donor. Would like to get tach working again. 

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KDCr7

Will do. Hoping to get at this week. Need to get a little practice soldering before i hit the speedo. Been a long time since ive done any.

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SkiPablo
Posted (edited)

@KDCr7do you have the speedo with just numbers or the one with the LCD screen at the bottom ?

Edited by SkiPablo

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KDCr7
Posted (edited)

@SkiPabloIt has the LCD screen with white numbers. 

Screen makes it very tight to get the iron in to the pins. 

IMG_20200308_110128.jpg

Edited by KDCr7
Figured out how to tag @user

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electricjohn

Someone, years back posted a link to the service manuals.

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SkiPablo
On 3/8/2020 at 2:35 PM, KDCr7 said:

@SkiPabloIt has the LCD screen with white numbers. 

Screen makes it very tight to get the iron in to the pins. 

IMG_20200308_110128.jpg

I've used one of these conductive pens before  - not sure if it will work in your case

https://www.amazon.com/gp/product/B01LYAA814

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KDCr7

@SkiPablo That looks pretty cool. Ill look into seeing if it would work. Thanks

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justgary
1 hour ago, KDCr7 said:

@SkiPablo That looks pretty cool. Ill look into seeing if it would work. Thanks

Much better to simply resolder each connection.  That's most likely the problem anyway. 

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asnowman

I had a bad solder issue on a pickup truck.  Intermittent gauges, then just dead.  I ordered stepper motors after seeing the price of a new display cluster. When i pulled it apart, i checked the solders first, adn found several had virtually no solder in them.  I added solder to each pin and tried it out, been working fine since.

not saying that's your issue, but i do have a box of stepper motors if you want one! 

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KDCr7

I'll definitely take a closer look at the solder.....when i get the circuit board out. Be great if that is the problem.

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KDCr7

Finished installing new stepper. Good news is the single line display still works.

Now i cant remember if the needle will move on the gauge with the ignition on (engine off) while spinning the paddle wheel? 

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SkiPablo

i doubt you can spin it fast enough to register

 

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KDCr7

I hope thats the case. It didnt register using an air compressor.

 

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KDCr7

Been meaning to update on this thread. After replacing the stepper motor, speedo wasnt registering when i spun the paddle wheel with air compressor. Decided to test the paddle wheel transducer. Followed this procedure https://c320.org/article.php/speedotesting. First used pins to test while everything was connected in the boat, test failed.  Next i cut the wiring to the transducer and pulled it out. Connected the wires to 9 volt battery, ran the test and failed again. 

Long story short, my speedo problem seems to be a failed paddle wheel transducer.

Next step is either NauticLogic gps (expensive way to find out if speedo actually works) or go analog

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