I have a 1990 chevy van i changed the alternator the battery and the belt and it still is discharging why?

the voltage regulater is built in to the altenater
I have a 1990 chevy van i changed the alternator the battery and the belt and it still is discharging why?
You only give partial description, - so I will take a guess! You mean it is discharging while it is parked? If so you are drawing current somewhere in the vehicle. Start out by disconnecting the battery cable, and see if the battery is %26quot;up%26quot; after (normal time it took to be down). A %26quot;disconnected%26quot; battery will hold a pretty good charge for several months! After you find it is (the vehicle)discharging due to some %26quot;draw%26quot;, -- disconenct battery cable, and put a test light between it and the battery..... If it is lit with everything %26quot;shut off%26quot;, - you can start unplugging things and pulling fuses till you find out where the problem is!



If on the other hand it does not charge the battery up while you are driving, -- start checking to see that the power is getting to the alternator %26quot;F%26quot; terminal,- (one of the two connections on back end of the alternator)- if you have nothing there, it can't charge! You could jump from the output connector (the one with the stud and nut holding cable on), if the engine %26quot;pulls%26quot; down a little, and you hear a %26quot;whirring%26quot; noise the alternator is charging (if you have an ampmeter, you can see the change, - if an idiot light- the light should go out!) And of course the power has to get from the alternator output to the battery,-- so you could %26quot;jump%26quot; a wire from alternator to battery (+) post, - if it sparks, the power isn't getting to battery!



Of course you have done what everybody else does, instead of having the charging system checked for operation, -(you can get this done free at most auto parts stores %26amp; WalMart). The battery could have been checked (individually),and eliminated, - the alternator could also have been checked individually and eliminated! The belt - though it may have been bad anyway,- would not have made any difference in charging, unless it was slipping, and you would have heard that !!
I have a 1990 chevy van i changed the alternator the battery and the belt and it still is discharging why?
u know start with the simple things first... i had a 94 gmc sierra i replaced the starter, battery, alternator cuz the shitt would never start the battery was always dying on me... could not udnerstand why.. turns out there was a bulb in my glove compartment that would stay on all the time and i guess it slwoly but surely keilled my battery every time.. so check the simplet hings first before you make the same mistake aas me and put 100's of dollar sthat did not have to be done.
maybe u have a bad wire connecting the alternator to the battery. or just a lot of corrosion around your battery terminals
this is a paracitic draw. it is most likely a light staying on. check the sun visor, glove box ,interrior , brake and any other lights that might stay on unnoticed. it could also be a short but that would most likely blow a fuse.
you need a starter
Maybe the alternator you installed was bad even though it is new?,maybe there is a open short somewhere in the vehicles electrical system?,maybe the new battery is bad even though it's new?.Having the vehicles ENTIRE ELECTRICAL SYSTEM checked by a TRUSTED MECHANIC should answer all your questions,just throwing parts at a problem is usually not the best idea.
Hook up a voltmeter to the battery. It should read about 12.6 volts. Now start the van, and the voltage should go up to 14.5 volts or so which means it's charging.



If not, then you still have a problem with the alternator or wiring.



If it passes this test, it means something is draining the battery when the motor is off. Try to find the source of the load and remove it, or turn it off.
discharging, sounds like it has syphilis
How do you know it is not charging?

Maybe a bad volt meter.