Posted by gurneejoe on February 25, 2011 at 04:31:47 from (50.9.21.74):
In Reply to: Checking an alternator posted by charlie M on February 24, 2011 at 16:29:52:
If the unit you have is the internal regulator Delco type, there is a 'D' shaped hole in the back of the case near the plug in which you can take a small screwdriver and touch the tab of metal at the bottom of the hole to the case of the alternator while it is running and it will bypass the regulator giving you full output at the battery connection if it is working. If you get full voltage, the regulator has failed. If partial voltage, the regulator and possibly one of the diodes is bad. If you can get the separate components anymore, they are very simple to replace. Rebuilt units are pretty reasonable now too. Most likely NAPA if they are to be had.
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