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  1. #1
    Junior Member orchemo's Avatar
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    Electrical question

    Last week I replaced the battery on the TW, all great afterwards. Then a few days later, when push the starter button, there would be nothing, a clock then no lights or anything.

    I took of the start solenoid and tested and thought it was bad, so I replaced it. After replacing and hooking up the battery, the starter ran whenever the battery was connected. Would not start until the key turned on, but the starter would run.

    Put the old solenoid back in and all is working fine. Something must be amiss. Was going to clean the main ground.

    Any other input?
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  2. #2
    Senior Member Badgerflorida's Avatar
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    You probably already made sure it wasn’t any of the satety switches (neutral, kickstand, kill)? Cheers
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    Senior Member Swingarm's Avatar
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    What is the battery voltage?
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    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by Swingarm View Post
    What is the battery voltage?
    Ditto
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    Senior Member jtstdub's Avatar
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    Everyone needs to learn to use a Volt meter!

    Lots of Youtube videos on how to use one.

    Amazes me that folks start removing parts etc without checking voltages...

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    Senior Member Miaugi's Avatar
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    The odd thing for me is the starter running continuously after installing a new solenoid? I would say the new part was either defective or somehow connected wrong causing a short and energizing the solenoid. As for the first problem possibly a loose connection at the battery which was fixed when you disconnected it to do the solenoid swap.
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  8. #7
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by orchemo View Post
    Last week I replaced the battery on the TW, all great afterwards. Then a few days later, when push the starter button, there would be nothing, a clock then no lights or anything.
    This is an indication of low voltage or high resistance connection.
    A new battery does not necessarily mean it is good or fully charged.
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  9. #8
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by orchemo View Post
    I took of the start solenoid and tested and thought it was bad, so I replaced it. After replacing and hooking up the battery, the starter ran whenever the battery was connected. Would not start until the key turned on, but the starter would run.
    To test the solenoid, the coil should activate when 12 vdc applied.
    When contacts closed, there should be almost no resistance across the high amp contacts.

    There are two primary issues with non-Bendix (TW has overrunning clutch engagement) type solenoids:

    1. Coil does not operate, due to bad coil (which is rare) or no voltage/inadequate voltage from starter push button and/or starter relay

    2. High amp contacts are burnt, causing high resistance/voltage drop to starter.
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  10. #9
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by orchemo View Post
    Put the old solenoid back in and all is working fine. Something must be amiss. Was going to clean the main ground.
    Perhaps starter button hung up, after new solenoid installed?

    Would need to see how it was wired to comment further

    Very good idea to check BOTH ends of BOTH battery cables.

    Was battery connection to solenoid corroded when solenoid first removed?

    Now that it seems to be OK, good for you to measure voltage:

    A. Key off, should be 12.6 for lead-acid or 12.8 for AGM

    B. Key on, probably drop to 12.5 (within a few seconds), mainly due to headlight load

    C. While operating starter, should be not less than 10.5

    For more details, see post one of this thread": Voltage readings - why we need them - The Sportster and Buell Motorcycle Forum - The XLFORUM®
    Last edited by SportsterDoc; 03-09-2018 at 12:28 PM.
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  11. #10
    Super Moderator Purple's Avatar
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    Quote Originally Posted by SportsterDoc View Post
    Perhaps starter button hung up, after new solenoid installed?
    This is the most likely source for the problem - if the starter engages with the battery , you have a short .....
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