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ODSS Bolters
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September 21-23
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Jan 21st, 2020
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Joined: Feb 2008
Posts: 222
OP
'Bolter
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I just replaced my alternator because it was showing a discharge on the ammeter. It also had a bearing that was going bad and had started squealing. My ammeter would always show negative at first start, as soon as I accelerated the engine it would jump to the positive and after a few seconds level out to the mid point on the ammeter gauge. Now that I have changed the alternator I am still getting a slight discharge. It is showing 12 plus volts at the alternator and the battery. What am I missing here. It starts fine each time and the battery is fine.
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Joined: Feb 2008
Posts: 222
OP
'Bolter
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Sorry guys the truck is a 58 Apache with a 235 12 volt system.
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Joined: Jul 2000
Posts: 2,039
Insomniac
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Gord
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1954 1/2 ton 235 4 speed
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Joined: Feb 2008
Posts: 222
OP
'Bolter
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No this is a different issue. Before I went from a generator to an alternator. This time I am replacing a bad alternator.
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Joined: Oct 2021
Posts: 3,146
'Bolter
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Your voltage regulator could be malfunctioning.
1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1956 Cadillac Sixty Special Fleetwood (The Godfather)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
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Joined: Feb 2004
Posts: 26,957
Kettle Custodian (pot stirrer)
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"Alternator" covers a lot of territory. Can you be a little more specific about which one was involved in the conversion from generator to alternator? The most common one is an internally regulated Delco 10-SI, but there are others that have an externally mounted voltage regulator. The wiring and diagnosis procedures are totally different.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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Joined: Feb 2008
Posts: 222
OP
'Bolter
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It is the 10-SI and it has the internal regulator.
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Joined: Feb 2004
Posts: 26,957
Kettle Custodian (pot stirrer)
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Use a small blade screwdriver in the D-shaped hole in the back of the alternator housing to bypass the regulator. It should go to a minimum of 15 volts at 1500 engine RPM if the alternator is good. If the voltage goes up with the regulator bypassed, either return the alternator as defective, or put a new regulator in it.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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Joined: Feb 2008
Posts: 222
OP
'Bolter
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Joined: Feb 2008
Posts: 222
OP
'Bolter
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Just solved my low voltage problem. I bought a new alternator from Orillys and discovered it was bad after having it tested at another store. swaped it out for another and it was bad only produced 12.5 volts. Picked up a third alternator and it was the same issue with the same voltage. Always showed a negative on the amp gauge. took it back and got a refund and went to Advance auto and purchased one from them, everything is right on point. Alternator is producing around 13.5 to 14 volts running. I am 74 years old and have replaced lots of parts over the years and this has never happened before. So beware guys, just because it is marked new does not mean a thing.
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