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Old 10-13-2013, 08:05 PM   #1
Join Date: Jan 2012
Vehicle: 1968 Mustang Coupe
Location: Pennsylvania
Posts: 4
Default 3G alternator in a 1968 coupe.

I've searched the forums and havent seen anything mentioned about the original voltage regulator. Is it necessary with the new alternator and if so which wires go from the new alternator to the wires from the old voltage regulator?
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Old 10-14-2013, 09:33 AM   #2
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Join Date: Aug 2007
Vehicle: 1967 Ford Mustang Fastback
Location: Davis, CA
Posts: 5,586

No, a 3G is internally regulated and does not require the external regulator. Can't tell you which wires go where, though. Usually if you google "3G alternator conversion" you come up with something. The factory service manual wiring diagrams would be helpful here.
Tad H.
'67 Fastback
331 stroker
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Old 10-14-2013, 02:15 PM   #3
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Join Date: Jun 2006
Vehicle: 1966 Mustange coupe
Location: Fontana, California
Posts: 1,481

Starfury is right on. To prevent confusion, sometime in the future you may want to remove the Vreg from the car - it is not necessary once the 1 wire system is put in. Also if you have upgraded the alternator output to more amperage, it's a good idea to run a second wire (2 Ga or larger) from the alt B+ term to the battery side of the starter relay terminal. The factory wire is not designed to carry the extra electrical load.
66 "C" code coupe bench seat
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Old 10-14-2013, 04:28 PM   #4
Join Date: Jan 2012
Vehicle: 1968 Mustang Coupe
Location: Pennsylvania
Posts: 4

Thank you for your help.
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Old 10-14-2013, 07:29 PM   #5
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Join Date: Nov 2006
Vehicle: 1965 2+2 & 2011 GT
Location: North Fulton, GA
Posts: 2,287

Here's a wiring diagram:
'65 2+2 EFI and 2011 GT
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Old 10-14-2013, 07:29 PM
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