Posted by 440roadrunner on March 31, 2009 at 16:58:03 from (98.145.76.31):
In Reply to: delco 10si posted by Bob M on March 31, 2009 at 16:39:06:
In addition to what Bob told you, here's a few more comments from the mentally aged.
It PROBABLY is not the regulator--that is, they usually don't fail in this manner.
It PROBABLY is resistance in the circuit, and this could either be in the batt + or the ground.
If you have a good meter, run the thing at a good fast (charging) speed with the battery up, and if possible, the lights on
Stab a probe DIRECTLY on the battery positive and stab the other directly on the alternator batt output stud. There should be VERY little voltage, maybe a few tenths, the lower the better
Ditto the ground. Stab a probe directly onto the batt neg post and the other directly to the alternator case. There should be almost no reading, the less the better.
In the case of equipment (not cars or trucks) which should have good solid grounds and little harness length, probably 3 tenths or less should be your "upper" limit.
I don't remember exactly the construction of these, but it seems to me that the internal mounting screws for the regulator could also cause a problem--loose or corroded means the ground for the regulator is insecure
Also I generally detest these so called "one wire" situations where the sense wire is also the main output lead. Any resistance in the charging lead means that the voltage will be high. Once again, in equipment/ tractors, with short harness length and good grounds, this really should not be a problem.
I'm not sure why, it's possible for certain battery problems (bad battery) to cause this situation.
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