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Ford 9N, 2N & 8N Discussion Forum
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alternator

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RandyinWNY

12-02-2003 07:09:49




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Hello gents, I've got a quick question. Dell?
A recent post talked about there being two different 12 volt alt.conv. I don't know how to tell which one I have. Is there an easy way to visually tell if I have the 1-wire or the 3-wire GM alternator. If I need to cheat with a jumper wire that was discussed, Where EXACTLY would I connect the cheater wire. My battery seems to be spilling over acid into the battery box when ever I run the tractor. It charges ok and holds a charge. It reads about 14.9 volts when charging. Thanks in advancve.
Randy....who is just a learner on 8N's.

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Jim Cox

12-02-2003 09:12:34




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 Re: alternator in reply to RandyinWNY, 12-02-2003 07:09:49  
your VREG is too hot. Like Dell says, get it to a real repair shop, before you need a new battery too.

Jim Cox



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randyinWNY

12-02-2003 09:48:07




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 Re: Re: alternator in reply to Jim Cox, 12-02-2003 09:12:34  
Does anyone know what the voltage should be reading when it is charging off the battery? Someone once told me that it should be between 14 and 15 volts charging. Is this right. What are your guys opinions on what the charging RANGE should be for 12 volt system? Thanks again guy's
....Randy



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rbell

12-02-2003 10:04:08




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 Re: Re: Re: alternator in reply to randyinWNY, 12-02-2003 09:48:07  
We were taught that a lead acid battery when fully charged will read 2.3 volts per cell.
So a "12 Volt" (thats 6 cell) battery will read 13.8 volts fully charged.
The alternator will need to develop slightly more than 13.8 volts in order to fully charge the "12 volt" battery.
Most Alternator guys say 14 volts



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DavidO

12-02-2003 10:00:23




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 Re: Re: Re: alternator in reply to randyinWNY, 12-02-2003 09:48:07  
The "theoretically ideal" charging voltage for a 12V "lead/acid" battery is 14.1 V. That has varied somewhat in later years with some of the newer batteries using different "chemical" compositions, etc., but it is still a good point to shoot for. The older automobile voltage regulators were set to 13.8V, but they were not real accurate and the manufacturers wanted a safety margin so as not to overcharge the battery. Most "internal" Alternator voltage regulators work close to 14.1V. There are variables that allow some deviation, but most should be in that area.

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Dell (WA)

12-02-2003 08:24:59




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 Re: alternator in reply to RandyinWNY, 12-02-2003 07:09:49  
Randy..... ....The deceptively desireable 1-wire converted version of the popular 3-wire Delco 10-SI alternator usually has a rubber plug slipped over the side-by-side P-1/P-2 terminals. But that is NOT a shure guide. The 1-wire alternator conversion had DIFFERENT internal voltage regulator module installed which uses electronic trickery to negate the P-1/P-2 terminal requirements.

And I don't know how to tell the modules apart. I am NOT an alternator repairman.

If'n yer battery is boilin' acid water, its probably a good indication that yer OVERCHARGING. I'd take it into a real alternator repair shop for checkout..... ....Dell

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