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Old 10-21-2007, 08:12 PM   #1
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After pulling off my Leece Neville 2800 JB alternator once to have it rebuilt...a second time because it still wasnt working properly, I still am experiencing the same issue. In a word, it spikes....I can watch the ammeter go way over zero and then slowly go way below zero. At the same time the ammeter is doing this, I can see the voltage spike also. After driving 10 minutes, it pretty much stays below zero...so much so that I normally start the generator to prevent discharging my batteries. Its a Du-Vac equipped alternator. I thought that this second time...it just cant be the alternator anymore...so Ive replaced my isolator with a new one and just replaced both starting and house batteries. Ive tested voltage at the alternator of up too 14.6 volts...but it just wont hold that, it settles back down to Nothing...where all Im reading is my battery voltage and reading 12.6-13.1 when the headlights are on and the MH has been sitting all day....well there is something wrong? any thoughts? Ive checked grounds...Ive traced wires. Because this is a Du-Vac unit, Im 99% sure all the smaller wires on the back of the alternator are correctly positioned(three small wires). Thanks for any input
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Old 10-21-2007, 08:12 PM   #2
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After pulling off my Leece Neville 2800 JB alternator once to have it rebuilt...a second time because it still wasnt working properly, I still am experiencing the same issue. In a word, it spikes....I can watch the ammeter go way over zero and then slowly go way below zero. At the same time the ammeter is doing this, I can see the voltage spike also. After driving 10 minutes, it pretty much stays below zero...so much so that I normally start the generator to prevent discharging my batteries. Its a Du-Vac equipped alternator. I thought that this second time...it just cant be the alternator anymore...so Ive replaced my isolator with a new one and just replaced both starting and house batteries. Ive tested voltage at the alternator of up too 14.6 volts...but it just wont hold that, it settles back down to Nothing...where all Im reading is my battery voltage and reading 12.6-13.1 when the headlights are on and the MH has been sitting all day....well there is something wrong? any thoughts? Ive checked grounds...Ive traced wires. Because this is a Du-Vac unit, Im 99% sure all the smaller wires on the back of the alternator are correctly positioned(three small wires). Thanks for any input
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Old 10-21-2007, 09:02 PM   #3
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If my car was acting the same way I would suspect a defective regulator. Not sure about your set up.
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Old 11-04-2007, 04:37 PM   #4
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If its like mine the regulator is replaceable without removing the alternator. I replaced mine two years ago myself and it was only about $40.00.
With a little mechanical ability its very easy job. You have three voltage selections to select from and the trick for the springs is a paper clip.
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Old 11-04-2007, 04:58 PM   #5
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Sounds to me like a bad diode in the alternator - basically means it is putting out AC instead of DC. But why, if you have rebuilt it twice?

Have you had the current alternator bench tested? That should rule out alternator failure (again).

Is the ammeter that reads funny current the dashboard unit or your test meter? The dash gauge might be bad but your meter probably is not.

I found a Leece test procedure online Here
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Old 12-15-2007, 08:53 PM   #6
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Thank you for that info on the Test site......Im still having my problems and since reading that Test procedure, it makes me wonder if my shop is testing it propertly. Thanks again.
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Old 12-19-2007, 05:16 AM   #7
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Take a DC voltage read at your battery while running, then switch the meter to AC. If you're having a reading of more than a few mili volts, you have a bad diode.
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