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Charging problem
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- 10+ Years
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Charging problem
I'm working on an SA that has been converted to 12v one wire alternator. The battery goes dead after a few starts. After an overnight charge at 14.2 the battery will hold at about 13.6. When the engine is running the ammeter shows discharge. A check with my multimeter confirmed the ammeter was wired backward. The alternator is putting out fine. Here's the problem. With the engine running the volt meter jumps all over the place, so fast you can't read it. The only thing I can find wrong is the reversed ammeter. Could this be the problem with the voltmeter? I checked every hot spot on the tractor that I could get to with the same result.
47 Cub (Glenda)
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
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- Team Cub Mentor
- Posts: 24144
- Joined: Sun Feb 02, 2003 12:50 pm
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- Location: OH, Circleville
Re: Charging problem
Dan - the ammeter being wired backward would not cause that. I would bet that the alternator has some shorted diodes in it.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.
My wife says I don't listen to her. - - - - - - - - Or something like that!
http://www.cubtug.com
If you can't fix it with a hammer, you've got an electrical problem.
My wife says I don't listen to her. - - - - - - - - Or something like that!
http://www.cubtug.com
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- 10+ Years
- Posts: 1631
- Joined: Fri Dec 22, 2006 6:28 am
- Zip Code: 37743
- Circle of Safety: Y
- Location: Tennessee East
Re: Charging problem
Problem fixed. The only thing I did was reverse the ammeter and everything is working properly. I still don't know why but I'm not going to question the results.
47 Cub (Glenda)
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
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- 10+ Years
- Posts: 2917
- Joined: Sat Feb 11, 2006 5:26 pm
- Location: NC
Re: Charging problem
The voltmeter, mounted on the tractor and connected to the tractor wiring or is the voltmeter a test instrument used momentarily to verify the voltage? A voltmeter connected to the tractor wiring draws a small current which can discharge the battery over time. Voltmeters should be wired so as to be powered only when the ignition switch is on.
Luck favors those who are prepared
-
- 10+ Years
- Posts: 1631
- Joined: Fri Dec 22, 2006 6:28 am
- Zip Code: 37743
- Circle of Safety: Y
- Location: Tennessee East
Re: Charging problem
It's a Sperry digital multimeter.
47 Cub (Glenda)
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
-
- Team Cub Mentor
- Posts: 24144
- Joined: Sun Feb 02, 2003 12:50 pm
- Zip Code: 43113
- Circle of Safety: Y
- Location: OH, Circleville
Re: Charging problem
Dan - I would bet that one of the connections to the ammeter was not a good solid connection. When you reversed the leads you must have made better connections than what you had before. Digital voltmeters are really sensitive on these types of circuits.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.
My wife says I don't listen to her. - - - - - - - - Or something like that!
http://www.cubtug.com
If you can't fix it with a hammer, you've got an electrical problem.
My wife says I don't listen to her. - - - - - - - - Or something like that!
http://www.cubtug.com
-
- 10+ Years
- Posts: 1631
- Joined: Fri Dec 22, 2006 6:28 am
- Zip Code: 37743
- Circle of Safety: Y
- Location: Tennessee East
Re: Charging problem
I think that is exactly what happened. Never to old to learn. Thanks BD.
47 Cub (Glenda)
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
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