Rebuilding/Repairing an Alternator

[Dynomite]

Rebuilding Chrome Alternator

A GM CS144 Alternator Rebuild was found on YouTube (By the Alternatorman) as follows which is the best Video I have seen.
Alternator Rebuild

All the Internal Alternator Parts between the Front Cover and Rear Cover (including Bearings, Voltage Regulator, Capacitor, Brushes, and Rectifier), are available on Ebay. In this case the Rectifier was toasted by maybe a screw driver stuck in the wrong place from the rear frying a Diode. The Chrome Alternator now charges perfectly.

1. Standard Motor Products RX131 Alternator Brush Assembly
2. NEW HEAVY DUTY VOLTAGE REGULATOR FOR DELCO 13120469, D677, D685, D698, VR472
3. Standard D-72 Alternator Rectifier - Diode(N) or Rectifier Assembly

A very nice Billet Aluminum Pulley is also available on Ebay.
This Alternator Pulley is the correct size replacing the Stock Alternator Pulley.
The Serpentine Belts does not have to be changed in most installations. MCH-208 Pulley installed See All Aluminum Alternator Pulley



Alternator Major Parts


Bench Testing Alternator Components
A. You can check the resistance of the Stator with Ohm Meter (checking each of three Stator wires to Stator Housing). Should NOT be an open circuit.
B. You can check each Diode with the Diode checker on Ohm Meter. Should be Infinity one direction and low reading other direction.
C. You can check the continuity and shorting of the Circuit from the Capacitor to Top Brush. Should be Infinity Reading on Ohm Meter.
D. You can check Bottom Brush to ground.....should be zero Ohms on Ohm Meter.
E. With Alternator assembled you can check Battery Post to Case with Diode checker on Ohm Meter. Should be infinity one direction and low reading other direction.

Rotor and Front Cover Separated from Rear Cover holding the Stator, Rectifier, Regulator, Capacitor, Brushes


Rear Cover with Stator Removed.....................................Rear Cover with Rectifier
Be careful when removing Rear Cover
as Brushes can get caught on Rotor Bearings


Backup Tail Light Switch and Rebuilding Chrome Alternator

[Roadster]

Just finished watching the two videos Cliff. Good find, very informative with a lot of good tips....If mine goes, although I have a replacement, will be rebuilding the original to keep as the new spare.