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Thread: jumping the starter on a m20b25

  1. #1
    Join Date
    Sep 2007
    Location
    Michigan
    Posts
    335

    Default jumping the starter on a m20b25

    Good Morning,
    I just put the motor and trans back in, getting ready to fire it up and wanted to crank it over a few times to build oil pressure. The starter only operates 1 in 10 times and only when it feels like it. Is there a jumper wire process to use to verify that the starter didn't get toasted?

    1990 535im 421,000 miles, 1987 325is, 1989 325is, 1990 m3, 1991 318is, 2001 X5 3.0

  2. #2
    Join Date
    Apr 2006
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    Chicago, Il. U.S.A.
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    4,243

    Default

    The small blk/yellow wire is the solenoid terminal. run a jumper to 12v to bypass the switch.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  3. #3
    Join Date
    Sep 2007
    Location
    Michigan
    Posts
    335

    Default

    Hi Ross,
    Tried that and got nothing. Is the solenoid toasted?
    Can one purchase a solenoid separately? Or is a used starter the way to go?

    1990 535im 421,000 miles, 1987 325is, 1989 325is, 1990 m3, 1991 318is, 2001 X5 3.0

  4. #4
    Join Date
    Dec 2003
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    PA
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    5,403

    Default

    solenoid toast or no ground to the starter.

  5. #5
    Join Date
    Sep 2007
    Location
    Michigan
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    335

    Default

    I cleaned the ground strap between the solenoid and starter. I did paint the starter a nice shiny black. Did I compromise my ground by doing that?

    1990 535im 421,000 miles, 1987 325is, 1989 325is, 1990 m3, 1991 318is, 2001 X5 3.0

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