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#1 |
Registered User
Join Date: Oct 2010
Location: Wallingford CT
Posts: 260
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Alt wiring
trying to convert to a 1 wire Alt in my 68 does it matter where i tie into the circut with the red wire? What becomes of the brown wire? Any help would be great i want to start pulling some new wires.
![]() Last edited by cpisani70@aol.com; 11-08-2010 at 10:07 AM. |
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#2 |
Registered User
![]() Join Date: Sep 2010
Location: Richmond, Va
Posts: 573
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Re: Alt wiring
I just folded up the original alt harness and taped it up near the drivers headlight. Ran a 10 gauge wire from new alt to battery voltage terminal on the right fender
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#3 |
Registered User
Join Date: Feb 2006
Location: Smyrna, Ga
Posts: 1,647
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Re: Alt wiring
There are some good threads on the site about how to wire the 1 wire alt.
It is best to go with the 3-wire setup, but thats your call. |
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#4 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Alt wiring
I am being told this on the Edelbrock site also but no one will tell me why My computer for the fuel injection reads 13.1 volts with the one wire but only reads 12.4 with the three wire and I get a low voltage alarm. Why is the one wire bad.
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#5 |
Registered User
Join Date: Oct 2010
Location: Wallingford CT
Posts: 260
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Re: Alt wiring
When you taped up the old wires and ran the new wire did the factory gauge still work???
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#6 |
Registered User
![]() Join Date: Sep 2010
Location: Richmond, Va
Posts: 573
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Re: Alt wiring
Yes. It just reads voltage. If you had a light instead of a gauge it may be mor complicated.
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#7 |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: Alt wiring
A volt meter will work. The factory ampmeter will not.
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#8 | |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: Alt wiring
Quote:
How did you wire your 3 wire alt? Did you do just jumper a wire from the output terminal to the votlage sence input? Or did you keep the factory wiring intact? If you did the short jumper, you will get low voltage elsewhere in the system. The voltage sence reads the voltage AT the alt and reducese the output to maintain 13 ~14vdc right there. No voltage drop is accounted for. Several feet of wire later, the wire resistance has dropped the voltage too low for your system. The factory wiring had a "remote" votage sencing wire tied into the system several feet and some load away from the alt. Now the alt pumps up the voltage to account for voltage drop and you can read proper voltage all the way to your computer. A 1 wire alt just blasts high voltage regaurdless of the load. It looks good at first, but it can do bad things like cooking the battery, and not charging at all at idle. Fixitp has a nice write up some where around here.
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#9 | |
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Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Alt wiring
Quote:
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#10 |
Registered User
Join Date: Oct 2010
Location: Wallingford CT
Posts: 260
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Re: Alt wiring
So the factory gauge says battery does that guage read volts bercause it would be nice if having it work was that simple.
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#11 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Alt wiring
The factory gauge on my 69 is a amp gauge it shows charge or discharge A Volt gauge will show volts like 11,12,13,14. They had a special resistance wire to go through the factory amp gauge. I've been told you can't make it work with the three wire but I really don't know.
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#12 | |
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Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: Alt wiring
Quote:
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