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Alternator test for output
What's the simplest way to to test a car alternator (12 volt system)? Type of testing instrument needed and range calibration?
Gauge in van is stuck, doesn't move during charge or discharge. Battery seems ok when externally charged.
Alternator may have been damaged by antifreeze "flooding" due to insecure radiator cap.
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Maybe give some free advice about: Cars?
Well, the easiest way to do this is to take the van to the nearest parts store or garage. Most parts places have a test rig that tests alternator output under load as well as battery condition. If you are nearby such a place, just fully charge the battery and drive there during the daylight (so you don't have to use the lights.) Please also remember not to use any electrical items you don't have to. Radio, A/C, blower motor, and anything else you don't absolutely need, should be left off while you are taking care of this.
As far as testing it at home, the fastest way would be to set your multimeter to DC and the appropriate range (if your meter isn't auto-ranging, that is.)
Before you start the vehicle, place the multi-meter leads on your battery terminals and see what the voltage is, without a charger connected.
Then start the vehicle, and go out and repeat the measurement you just did. At the very least, your voltage should have climbed substantially. Most vehicles these days seem to charge between 13.8-14.4 VDC.
If you aren't seeing that, then it is time to replace your alternator, or voltage regulator, if it isn't built into the alternator already.
Your local parts store will be able to tell you if the voltage regulator is internal or external to the alternator, if you don't already know.
While you are at it, I would get an aftermarket ammeter and voltmeter for your van, if you are fairly handy and feel it wouldn't be much of a challenge to install. This way you can always see your charge state and alternator output voltage at a glance.
Hope the repairs go easy for you.
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