[lro] Re: Alternator tach signal

From: Alan J. Richer (mrchurchill109@yahoo.com)
Date: Thu Jan 02 2003 - 07:31:09 EST

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    Er, Dave - I've never seen any kind of an AC component on
    that lead. Typically on my test rig (fancy word for a
    lash-up of motor and meters) all that signal does is sit @
    12 volts when connected to a lamp and the alternator is at
    rest, then it drops to zip and sinks 12 volts when the
    alternator kicks over. I will admit I've never had a scope
    on it, but high-resistance voltmeter should have shown a
    pulsing DC or AC component.

    The thing that mystifies me is that if there was any kind
    of RPM-dependent signal on that lead the bulb on the
    circuit would glow - perhaps dimly, but you would see
    illumination.

    You sure we're talking the same setup here?

                     ajr

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