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Thread: Early E23 L-Jet Ballast Resistor Glows Red Hot

  1. #26
    Join Date
    Dec 2018
    Location
    Alaska
    Posts
    47
    My Cars
    745i
    Sorry, either end of the red and black wire


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  2. #27
    Join Date
    Feb 2019
    Location
    Corpus Christi, Texas
    Posts
    43
    My Cars
    1981 BMW 733i
    alter.jpgalternator.jpg

    This is what the alternator side of that wiring looks like.

  3. #28
    Join Date
    Dec 2018
    Location
    Alaska
    Posts
    47
    My Cars
    745i
    It does look like those wires go from the starter to the alternator. In fact only one does. The two smaller wires return to the test port separately to remote start and monitor charge voltage.


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  4. #29
    Join Date
    Dec 2018
    Location
    Alaska
    Posts
    47
    My Cars
    745i
    And to the electronic control relay. I found them as I stripped out my old harness. I think you can actually see them in the rats nest of wires pictured above


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  5. #30
    Join Date
    Feb 2019
    Location
    Corpus Christi, Texas
    Posts
    43
    My Cars
    1981 BMW 733i
    With Danspeed's help, I was able to figure out that the wire that runs from the starter solenoid to the ballast resistor is grounding out. Thinking that they're might be a short in the original black/red wire in the loom, I ran a new wire from the starter solenoid to the ballast resistor as Dan suggested...still got the same thing happening. With the engine running, that solenoid terminal is grounding out as verified with a multimeter. When I tap the the wire against the terminal on the resistor, the engine wants to shut off.

    Is it possible that the solenoid is bad internally? Or perhaps the previous owner installed the wrong starter or solenoid?...it's definitely been replaced at some point.

    At a bit of a loss at this point.

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