Determine cause of Not Charging.
Start with a Multimeter on 12v scale.
Check voltage across battery terminals while car is idling.
Voltage should go from 12 v to about 14v when idle is increased.
Check for loose drive belt at Alternator.
Check Alternatir large main + terminal for voltage increasing to 14v which indicates Charging. An Ammeter ca be handy to see if you are getting current of 5 to 40 Amps into battery after using Starter motor.
Check for a small wire connector on the back of Alternator.
This should have Innition Key 12v when key is on.
This supplies the internal electronic regulator which controls current to rotor via the brushes.
If the Alternator is not producing power then Remove it for closer inspection or a replacement unit.
If you wish to tackle repairs to Alternator then place in a vice on workbench.
The Alternator faults break down into the following.
1. Brushes worn down.
Replace brushes & use homemade brush hook/holder to keep the spring loaded brushes compressed while re inserting them.
Mark the case with a scratch or marker before undoing the 3 bolts holding the assembly together.
2. Internal Regulator can often be replaced
3. Internal Diodes may be Bad (Shorted or Open)
4. The Rotor coil damaged
5. The Stator coils shorted or open.
Good Luck
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