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Old 10-03-2006, 12:49 PM
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frustrated!!

Hello, getting very frustrated. I just put the old altenator 3 wire back in and now it is over charging? It is a new battery and when i start the car the battery bubles over, what the hell did i do wrong?

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Old 10-03-2006, 01:08 PM
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I don't know the history, but do you have a DC meter that you can check the alternator's output with? Sounds like the regulator isn't doing it's job....
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Old 10-03-2006, 01:18 PM
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teh one i have shows it is high 15v + it is from auto zone and just lights up to say high normal or low. I just checked again and the back of the alt is magnetized even when the car is off?
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Old 10-03-2006, 01:20 PM
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Quote:
Originally Posted by Razors57chevy
teh one i have shows it is high 15v + it is from auto zone and just lights up to say high normal or low. I just checked again and the back of the alt is magnetized even when the car is off?
It should run about 13.5 volts DC I believe. I'm assuming your regulator is non-adjustable..?
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Old 10-03-2006, 01:23 PM
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how would you adjust it?
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Old 10-03-2006, 01:42 PM
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Some regulators are non-adjustable, some can be adjusted by an external knob, some have a set screw inside the regulator... depends on the regulator.

15V is a little high for an alternator output... what about trying the electrical forum here?
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Old 10-03-2006, 11:43 PM
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Quote:
Originally Posted by Razors57chevy
teh one i have shows it is high 15v + it is from auto zone and just lights up to say high normal or low. I just checked again and the back of the alt is magnetized even when the car is off?
my guess is you might want to check your wiring as the armature seems to be always on...and might be wired wrong.............thats a quick normally to see if an aleternator is charging is to check the back of it for magnetism, but yours is always on......hmmm I think regulators vary the field strength of the armature hence the magnetic field detected on the back........well if the armature is wired hot.......or incorrectly.........over charging???bad or incorrectly wired regulator.......well thats my 2 cents.......my brother accidentially hooked up a 2 wire internal regulator alternator for me.......hooked the sense wire to the ballast resistor. on the ignition coil, why he did that I dont know.........well that made the alternator output way over 14 volts........hence a boiled over battery
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