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Old 08-02-2020, 01:24 PM   #1
louieglen
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Default alternator

I bought a model A the fellow said he had just put a new 6V alternator on. I got it home noticed it wasn't charging Checking it has a 12V battery neg ground. How much trouble am I in? What alternator do I need to get that will fit the A? Thanks in advance.

Last edited by louieglen; 08-02-2020 at 01:36 PM.
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Old 08-02-2020, 01:28 PM   #2
wmws
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Default Re: alternator

Have you had trouble with the battery discharging.
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Old 08-02-2020, 01:36 PM   #3
louieglen
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Default Re: alternator

Yes.
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Old 08-02-2020, 01:44 PM   #4
wmws
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Default Re: alternator

Have you checked the output of the alternator with a multimeter. If so what did you get for output. If the output is good you may just have a bad battery not taking a charge. If your not getting any output then maybe you have a bad diode or some other trouble in the alternator. I will let others recommend and alternator as I don't use them.
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Old 08-02-2020, 02:07 PM   #5
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Default Re: alternator

I just noticed that you have a 6 volt alternator and a 12 volt battery. That won't work.
Go all 6 volt or 12 volt. I would check the output of the 6 volt alternator and if it is good just put in a 6 volt battery.
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Old 08-02-2020, 02:25 PM   #6
Charlie Stephens
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Default Re: alternator

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Quote:
Originally Posted by louieglen View Post
I bought a model A the fellow said he had just put a new 6V alternator on. I got it home noticed it wasn't charging Checking it has a 12V battery neg ground. How much trouble am I in? What alternator do I need to get that will fit the A? Thanks in advance.
What do you mean when you say "Checking it has a 12V battery neg ground". What is "it"? Is the vehicle 12 volts negative ground? Is the alternator 12 volts negative ground? If "it" is the alternator did you check it out or just read the tag? If you just read the tag may have been left over from before the alternator was modified the alternator to 6 volts.

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Old 08-02-2020, 02:45 PM   #7
louieglen
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Default Re: alternator

I don't understand your question. The car has a 6V alternator, and a 12V battery the neg. post is grounded to the car.
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Old 08-02-2020, 02:51 PM   #8
louieglen
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Default Re: alternator

I don'T want to change the 12V battery with a 6V. if I did that I would have to redo the head light's they are sealed beam. I would rather change the alternators. I need to know what 12V alternator single wire neg ground to buy that will fit the car.
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Old 08-02-2020, 05:31 PM   #9
Mulletwagon
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Default Re: alternator

All Model A parts dealers offer 12v alternators that are bolt on. Just an example:

https://www.snydersantiqueauto.com/P...el-a/generator

IMHO, negative ground 12v is the way to go.
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Old 08-02-2020, 07:18 PM   #10
duke36
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Default Re: alternator

Wagner Products: reliable and good pricing, 6v and 12v.
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Old 08-03-2020, 07:52 AM   #11
larrys40
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Default Re: alternator

Quote:
Originally Posted by duke36 View Post
Wagner Products: reliable and good pricing, 6v and 12v.
Duke,
Yes tom Wagner has without question the best alternator and bracket out there.
Tom is part of our st Louis Model A club and is not only a great knowledgeable guy on auto electrics but has the best alternator. I use them in customers cars all the time.
The other brands don’t hold a candle.

Look up Wagner products on line or he advertises in the Model A News and Restorer .
Larry shepard

Last edited by larrys40; 08-03-2020 at 09:57 AM.
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Old 08-03-2020, 09:13 AM   #12
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Default Re: alternator

The 6 volt pos or neg ground alternator is a conversion of the original Delco 10Si 12V negative ground, which are common as nails these days and can be had pretty cheap. Even the Asian knockoffs work well; the tech isn't rocket science any more. They were used on most Chevy models, many small Fords, AMC Jeeps, and others back in the day. You should be able to do a direct swap. You could then sell the 6V and make a few $$.
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Old 08-03-2020, 09:23 AM   #13
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Default Re: alternator

Quote:
I bought a model A the fellow said he had just put a new 6V alternator on.
Why not contact the PO and verify that it is a 6V alternator.
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Old 08-03-2020, 04:53 PM   #14
Patrick L.
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Default Re: alternator

We still don't know the output even after being asked.

Why would someone stick a 6v on a 12v vehicle. Maybe its missed marked.
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