Auto zone part number VR716, but it appears to be special order
NAPA part number ECH VR140, it shows they have them in the local warehouse here
Oreilly's part number R281, available within one day.
However, just what is the car doing or not doing? I assume it's not charging? This is cut and pasted from another forum since it's quicker than typing:
All of the old alternator systems work the same way, when you put battery voltage to the field the alternator will put out full output-this can be 16+ volts. when you disconnect the battery from the field the alternator will put out 0 volts. voltage can be varied by how fast the points cycle in the regulator. the actual figure you are looking for with a CHARGED BATTERY is 13.8-14.2 volts. with a low battery the voltage will be considerably higher, right after start the voltage will be higher, the voltage is regulated by the the voltage input by the voltage regulator and the time differential of open/closed points between the battery and field.
there are 2 common failure modes on a mechanical regulator
1-a break in the fine armature wire that controlls the points, this will result in 0 charge.
2-pitted points in the regulator, this usually results in the points sticking and you will get a 16+ volt charge, or just erratic readings.
checking for a bad regulator, you do that indirectly:
1-fully charge the battery and hook a voltmeter to it, it should read 12.5-12.8 volts.
2- start the car and look at the voltage on the voltmeter, it should read 13.8-14.2 volts.
3-if it reads around 16, replace the voltage regulator.
4-if it reads 12, unplug the regulator and jump from the battery to the field terminal on the regulator.
A-if the voltage jumps to around 16 replace the voltage regulator.
B-if the voltage stay at 12 replace the voltage regulator and alternator (you could just replace the voltage regulator but if the regulator was allowing the alternator to charge at 16 V and it burned out it will damage the new regulator.
these are just the rules for mechanical regulators and have no correlations to todays charging systems.
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