GM alternator
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Thread: GM alternator

  1. #1
    Exceeded sell by date Plumpcars's Avatar
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    GM alternator

    I'm running what looks like a seventies internally regulated alternator on the Chevy, probably about 60 amp output. Basically works fine except for one small hiccup the other day. There was no charge showing on the voltmeter until i'd done about 5 miles. I drove at a 'brisk pace' to try and 'excite' it but it eventually started charging when it felt like it. Since then I've used the car and it has been fine.
    I know the basics of how an alternator works and realise that this was a case of it charging once excited, which should have happened straight away with my set up. My question is do I ignore it and just keep an eye on the voltmeter or is it a sign that the alternator is on it's way out? I know I can get one pretty cheap but assume the cheap new ones are not genuine GM.
    I don't ned to run a high amperage unit as my car will never be seeing any high power drawing doo dads.
    You know the scenario, don't mind spending money on the car but object to throwing away good parts...It's an old person thing!

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    Re: GM alternator

    Probably only something silly like a dirty or stuck brush.
    Real Steel sell alternator rebuild kits- easy to fit plus the satisfaction of knowing its been done right.

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    Exceeded sell by date Plumpcars's Avatar
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    Re: GM alternator

    I didn't realise they sold repair kits there. Thanks Dave.

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    Re: GM alternator

    Make sure your battery cables and connections are good Steve (I know that might sound silly for someone of your caliber) but I had the same deal and I replaced battery cables and terminals as they do corrode inside after some time and cause high resistance that can make the charging go a bit wobbly.
    There's no replacement for displacement.

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