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Thread: Alternator Field Switch

  1. #1
    CTJER's Avatar
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    Default Alternator Field Switch

    I have the InterAV alternator installed. No Field Switch that I can find. The Installation Instruction Schematic shows "original field switch". The AC electrical schematic shows nothing like this. Is such a switch required? If so can someone recommend a part number and wire size?

    Jerry

  2. #2
    Glen Geller's Avatar
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    Default Re: Alternator Field Switch

    Quote Originally Posted by CTJER View Post
    I have the InterAV alternator installed. No Field Switch that I can find. The Installation Instruction Schematic shows "original field switch". The AC electrical schematic shows nothing like this. Is such a switch required? If so can someone recommend a part number and wire size?

    Jerry
    Is the circuit breaker acting as a field switch?

    Sent from my SM-G955U using ShortWingPipers.Org mobile app
    Glen Geller
    1955 PA22-150 "One For Papa!"

  3. #3
    CTJER's Avatar
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    Default Re: Alternator Field Switch

    Don't think the CB is used as a switch. Glen do you have a switch installed? If was it original eqpt?

    Jerry

  4. #4

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    Default Re: Alternator Field Switch

    Are you saying that you have no way of controlling when its on or off?

  5. #5
    CTJER's Avatar
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    Default Re: Alternator Field Switch

    Yes. No on/Off control. Seems OK as the installation was done in 1993. Nevertheless I plan to add in a switch soon.

  6. #6
    CamTom12's Avatar
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    Default Re: Alternator Field Switch

    Quote Originally Posted by Glen Geller View Post
    Is the circuit breaker acting as a field switch?

    Sent from my SM-G955U using ShortWingPipers.Org mobile app
    Mine is wired like this. When the engine is turning I want the alternator alternating, and when I donít (emergency) Iíll pull the CB.

  7. #7

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    Default Re: Alternator Field Switch

    Do you have a double pole / double throw master switch?


  8. #8
    ClippedWing's Avatar
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    Default Re: Alternator Field Switch

    I don’t want to hijack the thread but I’ve got a Delco Alternator with a separate “ALT” switch adjacent to the master switch. Is there any reason to turn this off? I’ve been starting with it off and switching it on after start but is there a reason for that? I don’t have any manual reference for it.

    Thanks,

    Chris

  9. #9
    CamTom12's Avatar
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    Default Re: Alternator Field Switch

    Quote Originally Posted by ClippedWing View Post
    I donít want to hijack the thread but Iíve got a Delco Alternator with a separate ďALTĒ switch adjacent to the master switch. Is there any reason to turn this off? Iíve been starting with it off and switching it on after start but is there a reason for that? I donít have any manual reference for it.

    Thanks,

    Chris
    I donít see any reason to turn it off unless thereís a problem with it.

  10. #10

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    Default Re: Alternator Field Switch

    There should be a way to shut off the field but no reason for it to ever be off unless there is a problem. A pullable circuit breaker can be used as a field switch. I installed circuit breaker/switches in the last couple of conversions I installed to save panel space. It also works to use the original generator switch which may be what was meant by “original field switch”.
    Last edited by Jeff J; 01-17-2019 at 11:08 PM.
    "Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

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