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Thread: PWM went badly wrong when testing it on my motorguide 70 lbs TM - please help! thanks

  1. 11-08-2015, 08:43 AM #1
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    Default PWM went badly wrong when testing it on my motorguide 70 lbs TM - please help! thanks


    i tested my Digital maximizer system on my big foot controlled motorguide 70 lb TM (trolling motor) under 24 volts and it worked beautifully until I fried my TM because I didn't have 50 amps circuit breaker added. Need to troubleshoot it or buy another TM. These big boys are really expensive $500+ for new and $250 for used from my quick research. Bummer.


    1. How do i troubleshoot my TM? I guess i need to open up the trolling motor to check but what exactly do i look for?
    2. How do i add an inline circuit breaker for a 24 volts system if i am lucky to get it back to work?https://www.youtube.com/watch?v=Zd6CYI_Inxs

    https://www.youtube.com/watch?v=_kMZhyowwdQ&list=PLpjSRCf07NBL02PFSY5uSoDD RvDN4MR1K
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  2. 11-08-2015, 10:33 AM #2
    skunked again
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    I'm curious as to what you find wrong. Thinking about putting a pwm on my tm. Which pwm did you use?
    Can you post a pic of it, and how you mounted it?
    Drinkin coffee, missin fish.
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  3. 11-08-2015, 11:25 AM #3
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    What is a PWM ?



    MEMBER CRAPPIE MAFIA
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  4. 11-08-2015, 11:47 AM #4
    skunked again
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    A "pwm" is a pulse wave modulator ". It converts the DC to pulses, basically makes it a digital signal.
    A cheap way to convert a 5 speed trolling motor to a variable speed motor.
    Please correct me if I'm wrong
    Drinkin coffee, missin fish.
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  5. 11-08-2015, 02:14 PM #5
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    https://m.youtube.com/playlist?list=...Gdx9fwOGmGSEWg
    Check my video description for detail parts I used
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  6. 11-08-2015, 02:16 PM #6
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    Definitely worth the money to add PWM. 2 reasons: 1. Increase ur battery run time to twice as long. 2 get set speed to match wind or current which the 5 gears can't do
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  7. 11-08-2015, 04:18 PM #7
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    why not just get a variable speed TM? Almost sounds like it might be cheaper in the long run
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  8. 11-08-2015, 04:28 PM #8
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    Your PWM and your motor will work much better if you run your 24 V motor on 24V. But remember, the PWM does not work at all when running the motor full speed.
    Fair Winds and Following Seas

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  9. 11-08-2015, 07:22 PM #9
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    Default can u elaborate why PWM not work at max speed?

    Quote Originally Posted by Barnacle Bill View Post
    Your PWM and your motor will work much better if you run your 24 V motor on 24V. But remember, the PWM does not work at all when running the motor full speed.
    yes, i did run my mtoroguide 70 lbs with 24 volts, it showed in my lcd digital meter display. I will be able to prove or disprove your theory after I fix my motorguide 70 lbs TM or buy a new one. I will report back for all to see, but for now please explain so we can learn from your knowledge.

    Thanks.
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  10. 11-08-2015, 07:48 PM #10
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    All the PWM can do is reduce the power going to the motor. Really no way it could cause motor damage with or without a breaker.
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