Battery Charging
Posted: June 20th, 2014, 6:03 pm
Second Question:
I have only recently owned my 1930 AA (for the second time) after it was restored by a former student of mine. (long story not necessary now). He converted it to a negative ground 12 volt system all in accord with the information in the "Schild book" and in accord with other references on the subject.
Almost from the beginning I frequently found the truck with a dead battery, and after much testing discovered that the alternator had a dead short to ground at the output terminal. I replaced the alternator with a Delco 10 SI, 65 amp, the one most recommended.
At this point all I can say is that the alternator seems to keep the battery charged, but if I turn on the halogen lights the ammeter shifts to a discharge position of seven amps. I have never seen the ammeter show a charging position since I installed the new alternator, even when the battery was low. Right now, I assume that if I were driving with the lights on, I would be running and lighting off the battery, rather than with energy from the alternator.
I am at a loss. Basically, I guess I don't know how to test the charging system. I have a "multitester" with amps, volts and ohms resistance, but I am not sure what I should expect as suitable at any reading of the meter. I was told that if the battery showed a charge of 13.5 volts I and the truck should be happy. It showed 12.5, and I am curious, but not happy.
Any and all advice will be appreciated.
John Losch
I have only recently owned my 1930 AA (for the second time) after it was restored by a former student of mine. (long story not necessary now). He converted it to a negative ground 12 volt system all in accord with the information in the "Schild book" and in accord with other references on the subject.
Almost from the beginning I frequently found the truck with a dead battery, and after much testing discovered that the alternator had a dead short to ground at the output terminal. I replaced the alternator with a Delco 10 SI, 65 amp, the one most recommended.
At this point all I can say is that the alternator seems to keep the battery charged, but if I turn on the halogen lights the ammeter shifts to a discharge position of seven amps. I have never seen the ammeter show a charging position since I installed the new alternator, even when the battery was low. Right now, I assume that if I were driving with the lights on, I would be running and lighting off the battery, rather than with energy from the alternator.
I am at a loss. Basically, I guess I don't know how to test the charging system. I have a "multitester" with amps, volts and ohms resistance, but I am not sure what I should expect as suitable at any reading of the meter. I was told that if the battery showed a charge of 13.5 volts I and the truck should be happy. It showed 12.5, and I am curious, but not happy.
Any and all advice will be appreciated.
John Losch