New battery won't charge, alt. good from bone yard, is there a voltage regulater on this car?

your voltage regulater is not working letting alternator run away most alt have an internal regulater

Get each and every part separately bench tested and get the voltage test of each part.The battery,alternator and Voltage regular.For step by step troubleshooting,click the link below:

http://alltypesofpartsreplacing.blogspot.com/2012/11/car-battery-warning-light-battery.html

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This will help.

Thanks.

voltage regulator. it may be in the alternator, or remote mounted. ((the alternator can be charging, but if voltage regulator is'nt working then it won't allow voltage to get back to the battery to keep it charged

14.9 to 15 volts is normal for a battery and the voltage regulator is built into the alt they dont often make a rebuild kit for alts anymore so buying a new one is easyer but you dont have to do that cause there is nothing wrong with it.

First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

Usually when the battery light comes on it means there is a problem with the alternator. It means it is putting out less than 12.2-12.5 volts.

volta regulater is in the pcm ( power control modual ) you need a pcm or a external voltage reg . the reg is what controls the alt out put

depending on the year model of your car the voltage regulator is intergrated in the pcm

need to check battery and charging system with tester sounds like possibility of a bad charging system, alt or voltage regulater or bad connections

well for starters your altenator is bad because what it is dolinging is over charging the battery hence why it boiled off the water/acid in the battery. the regulater is intergrated into the altenator. there is not a short because numberone your car would not start and two your battery would explode. i never test a battery or altenator at a store like napa or Oreilly's because they are not mechanics ......they are parts guys. your altenator should charge the battery at no more than 14 volts and the average is 13.5 volts. you need to replace the altenator the reason why you are losing a charge is be cause as the car is running the battery is being discharged because the regulator is defective in the altenator. please rate this thanks