On what are you connecting the test light to on the alt? If you connect it to the large single post on the rear it will light,because this is direct battery voltage.
To answer your question about the doides,if one is out yes the alt can charge but maybe not to it's full potential.The diode is like a check valve in a water line, juice can go through one way but not back.If the doide or diodes are out then juice can come back through causing back feed making the voltage reg stay engagued and run the batt down.
There are 3 postive and 3 negative doides.The alternator makes A.C. current and the diodes convert A.C. to D.C.
[This message has been edited by lnjstreetrods (edited 10-15-2000).]
the reason i posted this is because when i take my light wire lose and my alternator wire lose,then take my battery hot cable lose....i used a test light between the hot cable and battery post it doesn't light up.when i do the same with the light cable it doesn't light up.only when i connect the battery with the alternator wire do i get a light on the test light.does this mean i have a bad alternator?
Have you taken it to a parts store to have it checked? I would to make sure, but like others have said the wire from the battery to the alternator dosn't go to just the alternator. If you only disconnected the alternator wire while using the test light and it went out then the problem is the alternator. There is no need to take the light wire loose.
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