The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first
SOURCE: Bench Test explorer 1998 rear wiper motor
power is wht/or & blk/blu. to make the wiper move both left and right across window, it alternates positive and negative polarity.
SOURCE: 2002 monte carlo will not charge has a new battery
When the engine is running fast idle, the battery voltage should read 13.5 to 14.5 volts if the alternator is delivering charge to the battery. If the old alternator had a shorted diode, the very high current from the battery back through that diode will burn out what is known as a fuse link which is located within the wiring harness and it will effectively disconnect the alternator output from the battery. The battery end is connected at the starter terminal where the positive battery cable also connects.
SOURCE: I get 14 to 16 volts at the alternator and only 12 at the battery
when running your car ur battery should be around 12.4v to 13.2v ur car runs off the alternator and should be putting out more the 12 volts bc of all the assesories in ur car need more then 12volts there are no problems with ur car it should be like that
SOURCE: 1995 mystique, battery light is on, 12 volts
Was the old alternator tested to see if it was bad? If it was and all wires are in good shape and reconnected the new alternator the new one may be bad also. It can happen.
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