Question about 2005 Datsun 720
New battery, new alternator. Battery charges when idling but loses charge at speed.
Could it be the regulator?
81 datsun truck (720)
This sounds like the altenator belt is loose. When the altenator is under a load the magnetic field causes the altenator to require more fource to rotate. At higher engine rpms the belt can be slipping on the altenator pulley. There is one other possibility I can think of and that would be that the voltage regulator is faulty and and causing an overvoltage at higher engine speeds and therfore opening up the field circuit to prevent the altenator from over charging the battery this is a safety function of the regulator. I would check the belt first.
Posted on Mar 04, 2009
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Posted on Jan 02, 2017
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