Alternator Humming!?!
06-02-2007, 01:56 AM
#1
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Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Alternator Humming!?!
I just got everything back together for a first startup. When the ignition is on my alternator hums. But only when the wiring connector is pressed inward. It started doing this and jiggling with the connector got it to quit doing it all the time.
I'm getting 12.55 volts at the battery, 12.50 after the kill switch, 12.49 to my distro block in the bay, and 12.49 to my alt. What could be going on here...nothing?
I'm getting 12.55 volts at the battery, 12.50 after the kill switch, 12.49 to my distro block in the bay, and 12.49 to my alt. What could be going on here...nothing?
06-02-2007, 05:42 AM
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Car: 1986 iroc z
Engine: vortec 383
Transmission: th350
Axle/Gears: 3.73 moser 12 bolt true trac
Re: Alternator Humming!?!
what was the last thing you did concerning the alternator?
06-02-2007, 02:57 PM
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Car: 1986 iroc z
Engine: vortec 383
Transmission: th350
Axle/Gears: 3.73 moser 12 bolt true trac
Re: Alternator Humming!?!
no what did you do? Is it new or somthing? Or did it just start doing this out of the blue? take it to autozone for free and they will test it for you.
06-02-2007, 07:07 PM
#5
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Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Re: Alternator Humming!?!
This alt is not new. Not old but not new. A friend has a busniess that rebuilds alts and starters and he built this one to 140 amps. It has never done this before.
06-06-2007, 08:48 PM
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Car: 84 Z28, 89 RS, 98 SS
Engine: 350 .060 over, 350 .040 over, LS1
Transmission: TH350, TH700r4, T56
Axle/Gears: 4.11 spool, 3.73 open, 3.42 posi
Re: Alternator Humming!?!
Looking at your voltage readings, it sounds like you have dailed diodes this will also cause a high pitch noise from the alt.
06-06-2007, 10:10 PM
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Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Re: Alternator Humming!?!
I couldn't get the voltage when the car ran for the extremely short time it did. But the voltage was fine with everything connected.
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