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Help Electrical Questions

Discussion in 'Tech Tips' started by Frankster, Jun 22, 2018.

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  1. jmw76

    jmw76 Well-Known Member

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    Start by connecting together your leads from your meter and taking a measurement. This will most likely be a value greater than zero (0.0 ohm). Subtract this measurement from the value you get when measuring the primary resistance.
     
    jmw76, Apr 19, 2024
    #101
  2. jmw76

    jmw76 Well-Known Member

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    Also, make sure all the connection points are clean.
     
    jmw76, Apr 19, 2024
    #102
  3. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I might need a new multimeter; the leads are old and my readings are all over the place. It reads 1.6ohms when I touch the lead tips together. Then it reads 4.4ohms when I use the coil spade connectors to measure primary resistance and then it reads 7.7ohms when I connect the wiring plug back on and use the plug to test resistance. At least when I subtract the 1.6ohms resistance of the meter from the 4.4ohms resistance at the spade connectors, my 2.8ohms sits within the tolerances in the workshop manual. I might get some new ignition leads and also clean everything up. What do you recommend for cleaning electrical connectors?

    upload_2024-4-19_19-12-18.png
     
    Frankster, Apr 19, 2024
    #103
  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Put a new battery in the meter.

    Check resistance of the probe leads, subtract that from the reading against any component (ie primary side)
     
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    Linkin, Apr 19, 2024
    #104
  5. jmw76

    jmw76 Well-Known Member

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    • Like Like x 1
    jmw76, Apr 19, 2024
    #105
  6. jmw76

    jmw76 Well-Known Member

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    A typical economical multimeter (like this one https://www.jaycar.com.au/economy-catiii-multimeter-with-non-contact-voltage-sensor/p/QM1527 ) might have a stated accuracy of +/-1% for resistance measurements.
    Sounds good !!!! WRONG. the accuracy is usually a statement of the accuracy relative to the full scale deflection. So if the meter is set on the 200 ohm range the accuracy may only be +/- 2 ohm (+/- 1%). Working at the bottom end of any instruments range is always an issue.
     
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    jmw76, Apr 19, 2024
    #106
  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    99 times out of 100 "coil problems" as tested by multimeters turn out to be red herrings.
     
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    maelstrom, Apr 21, 2024
    #107
  8. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I finally got some time to chase this coil 'problem' down. After changing the battery in my Multimeter I was greeted by same nonsense readings so I pulled the coil harness apart to check everything at individual item level. I found that one of the connectors to a coil spade was a little loose. It looked like someone had been in there at some stage as the covering plastic protector had a perfectly straight cut along one edge and it had been glued back together. A bit of a crimp and a bit of solder and all is now well. Thanks to all that contributed to this sub-thread. I learnt a bit more about my least favourite part of any motorcycle...the electrics!
     
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    Frankster, Apr 23, 2024
    #108
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