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06-08-2014, 08:02 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Alternator Voltage Regulator help
I discovered that one of the wires from the voltage regulator ends in the wire loom and is not connected. According to the drawing in this link, that wire should go to the alternator stator.
Ford Voltage Regulator Wiring Diagrams.
Also the drawing show a ground wire going to the battery. It is not connected either.
I purchase this car about 7yrs ago. The battery always stays charged. However with a heavy load (lights and cooling fan on), the voltage will drop below 12 at lower rpm.
I am not certain that the wire diagram in the link is correct for my setup. If it is correct and my alternator is not wired correctly, would it charge? I'm confused! |
06-08-2014, 08:48 PM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Not Ranked
If it's worked ok as is for the past seven years, I'd cover up the loose ends with tape, keep doing what I'd been doing for the past seven years, and sleep well at night.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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06-08-2014, 08:51 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Quote:
Originally Posted by olddog
I discovered that one of the wires from the voltage regulator ends in the wire loom and is not connected. According to the drawing in this link, that wire should go to the alternator stator.
Ford Voltage Regulator Wiring Diagrams.
Also the drawing show a ground wire going to the battery. It is not connected either.
I purchase this car about 7yrs ago. The battery always stays charged. However with a heavy load (lights and cooling fan on), the voltage will drop below 12 at lower rpm.
I am not certain that the wire diagram in the link is correct for my setup. If it is correct and my alternator is not wired correctly, would it charge? I'm confused! |
i think your fine, one of the wires is not supposed to be connected.
if you have an ammeter it will just be hanging there. Ford service manual picture below
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Fred B
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06-09-2014, 05:24 AM
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Join Date: Feb 2009
Posts: 1,695
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I have the same problem. I realized it was due to putting on aftermarket pulleys on the crank. alternator, and water pump. The larger pulleys makes the alternator turn slower than normal at about 800 RPMs or less and it will stop charging. Give it a little gas and it jumps to 14 volts.
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06-09-2014, 09:39 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Thanks FWB.
I do not have an amp meter (voltage meter), but it looks like that wire is still not needed, based on the schematic you posted.
However it does show a ground wire. It does not have a ground wire connected to the alternator. Must be grounding through the mounting bolts. That would seem a bad thing to me.
Thoughts?
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06-10-2014, 06:16 AM
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CC Member
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Join Date: Feb 2008
Location: Rochester,
NY
Cobra Make, Engine: Superformance
Posts: 194
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Maybe your car has a one wire alternator, as does mine ( an SPF ). In this case, the voltage regulator isnt used and the only connection thats needed is the one to the battery. Any other voltage regulator wires end in the wire loom. Seems odd though that the battery drops below 12. Maybe you have an alternator issue.
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06-10-2014, 06:38 AM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,405
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On a fiberglass car, you need to ground the voltage regulator case. There is usually a ground wire which originates in the wiring harness connected to one mounting bolt. Send me some photos and I'll look them over and see what you have. What is your chassis number?
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Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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06-10-2014, 08:17 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Quote:
Originally Posted by STEVE-O
Maybe your car has a one wire alternator, as does mine ( an SPF ). In this case, the voltage regulator isnt used and the only connection thats needed is the one to the battery. Any other voltage regulator wires end in the wire loom. Seems odd though that the battery drops below 12. Maybe you have an alternator issue.
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No. The alternator has 2 wires connected to a KVR202B Ford voltage regulator mounted on top of the passenger foot box, as shown in the drawings. |
06-10-2014, 08:29 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Quote:
Originally Posted by Blas
On a fiberglass car, you need to ground the voltage regulator case. There is usually a ground wire which originates in the wiring harness connected to one mounting bolt. Send me some photos and I'll look them over and see what you have. What is your chassis number?
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Yes the voltage regulator case must be grounded. Voltage regulator is a KVR202B. The alternator has the square ear as pictured in the link in my first post.
After looking at the diagram that FWB posted, that is how my car is wired up. That diagram shows the alternator going to ground, but it does not specify how. The diagram in the link in my first post calls for a #10 ground wire to the battery. I have no ground wire going from the alternator to the battery (or anywhere else). I am pretty sure the case is grounding to the engine block by the mounting bolts or it would not work. My question now, is the ground wire necessary or is grounding through the mount good enough? |
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