Posted by RodInNS on February 15, 2011 at 13:36:56 from (216.118.158.123):
In Reply to: Alternater 17.5volts posted by Jakers on February 15, 2011 at 09:42:40:
14.2 is generally considered nominal charge voltage. Some Ford/motorcraft alt's used to charge over 15 at times. Things to check are... the basic connections at the alt and regulator. Make sure the alternator is properly grounded. If it has an external regulator you need to check all of the connections between the alt and reg to make sure they're clean and tight. If it's got an internal reg you need to determine where it takes it's 'sense' voltage from for the regulator. Again... if it was sensing from a remote location closer to the battery and NOT getting a clean sense... ie low voltage... then the reg is telling the alt to keep pushing because the battery is low... so check connections. I think that's more likely than a bad regulator simply because most I've seen go bad had some pretty wild voltages; sometimes 25+ volts. This one is just on the line...
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