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Help Please ! - Spec voltage for EXCITER lead to alternator Posted by Mark in Marine [Email] (#1837) [Profile/Gallery] (more from Mark in Marine) on Thu, 4 Jul 2019 16:36:28 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Bernie, Swedecar, or other mechanics with alternator exciter lead experience:
What voltage should be on the EXCITER lead (D+) at the alternator when the ignition is "ON" but not running?
Is 0.77V high enough to power up the alternator ? A friend in Australia has a 9-5 with a newly-installed rebuilt Bosch alternator, but it is not charging. The battery has about 12.49V at rest.
- engine off and ignition off, big alternator nut contact point (B+) = 12.49 v
small alternator nut contact point (D+) = 0 v
- engine off and ignition on, big alternator nut contact point (B+) = 12.03 v
small alternator nut contact point (D+) = 0.77 v
- engine on and running, big alternator nut contact point (B+) = 11.79 v
small alternator nut contact point (D+) = 0.77 v
The battery supposedly checked out good, but car was failing to charge. A "loaner" battery gave the same result, and on advice from mechanic, the owner replaced the alternator.
I will have one of my daughters' cars on Sunday to do brakes, and I will be able to measure these voltages on that (presumably working) car then, but I'm looking for some confirmation of what this voltage should be. Of course, when the alternator is working the D+ should change as the alternator regulator does its job - correct ?
Thanks in advance !
Mark in Marine
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