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If the alternator and battery are good, then clearly you have a wiring/connection issue of some sort.
I'd start by checking ALL the fuses (just for surety - ask me how I know), and then if that checks out, then check the wires that connect to the alternator to see if the proper voltage signals are there. Also, be sure that the battery cable connections are good at both ends (battery terminal ends, and the ends that connect to the car), all need to be clean and tight. If there is any corrosion or looseness of any connection it will cause problems. Good luck!
check the belt condition and tension. Have a load test done on the battery as it will not charge if there is a cell problem. Check that the battery posts and terminals are shiny clean. have the alternator bench tested for output and operational diode pack
Well, you start with the battery. It needs to be FULLY charged, that means about 4 to 6 hours on a real charger. Then you load test the battery.
If battery checks out okay, pull the alternator and have it bench tested, specifically test the diodes for open.
To narrow down the offending system/item: pull interior light fuse, and clock fuse, disconnect negative battery terminal, and put a light between the cable and the battery terminal (or a volt meter). if the light lights or you show voltage, disconnect circuits, one at a time, and retest....Eventually you will find the offending item.
If the vehicle stalls when you pull the battery cable loose from the battery the alternator can not be good because the car would stay running. You have an issue with the charging system, Possible voltage regulator which is in the alternator. Have the alternator taken of the van and tested a the parts house.
i have purchased alternators that were bad but take it and have it tested if it tests good and still wont charge jump a wire from the small red wire on the connector on th\e side to the post on the alternator it will charge
May I suggest that you drive your car to one of the major auto stores and they can and will check your alternator for you to make sure it is good/bad.These places like AutoZone do this all the time. They do not charge for the check out. (Of course they are hoping that if you need a part you will buy it from them.
One other suggestion. If you do need a new alternator, get a rebuilt one. It is cheaper and most always comes with a warranty.
Hope this helps Good luck Loringh PS please take a moment to give me a rating