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Re: the car wont take a complete charge
If able, ck the charging voltage at the battery. The alternater should be charging the battery between 13,6 to 14.2v. The lower the voltage the more its charging. Make sure both battery cables are clean and tight. Good Luck.
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if wont jump battery has internal short and is bad replace with good battery get cheap ohm meter to test alternator out put. install battery ck voltage start engine ck voltage should rear 13-14 volts if not charging will read battery voltage with steady voltage drop. running with neg. cable unhooked can cause damage from voltage spike.
In order for the alternater to charge there has to be some current in the battery; it may needan external charge boost to do the testing. Since replacements have already been made there must be an internal current drain on the battery Since the radio will not shut off this would be the most likely component to start checking. Suggest you locate and remove the appropriate fuse and see if the battery discharges after it has beencharged -up If this solves the problem then obviously the radio needs to be replaced. A test light inserted between the negative post of the battery and the negative battery cable will indicate battery drain but some is normal due to to computer keep-a- live and security systems.
sounds like your alternater is not fixed. Your car ran off of battery power till you drained it. Complete alternater repair and charge battery. You can check if your alternater works by starting car and disconnect positive cable if it stays running your alternate is fixed. Shut car off and replace positive cable.
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.
sometimes you are just the unlucky soul that gets bum alternators or your battery in the truck has enough juce to crank it over but is almost dead and your alternator is burning up trying to charge a battery that wont accept a decent charge. plus clean the battery terminals