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06-06-2014, 02:01 PM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
High voltage???
I had to install a new alternator because the old one was dead in car and on tester at parts shop.
Now I think I'm getting to much voltage.
With the rpms above 2000 or so I get 15 volts with nothing on.
I put 2 new voltage regs on so far with the same 15 volts.
If I run the fan and head lights I get 13 volts so that's what I have been doing.
I checked all connections and ran a ground from the volt reg and I still get 15 volts.
Is 15 volts a problem?
Checked with dash gauge and hand held volt meter.
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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06-06-2014, 04:07 PM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,501
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Not Ranked
Mine charges at a steady 14.5 volts across a meter. I don't think 15V is anything to be concerned about.
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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06-06-2014, 08:55 PM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Not Ranked
Where are you seeing 15 volts, from thr alternator or at the battery?
__________________
" It ain't no big deal" 
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06-06-2014, 09:01 PM
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Senior Club Cobra Member
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Join Date: Jun 2000
Location: Gilford,
NH
Cobra Make, Engine: FFR 302 carb
Posts: 8,121
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Not Ranked
Is the battery fully charged? Are you looking at the dash meter? Have you checked at the battery with a good gauge.
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06-06-2014, 09:45 PM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
I'm checking with a multi-meter at the battery and I get the same reading on the dash.
Battery is reading 12.7-12.8 with the car off so I think the battery is fully charged.
All high readings is above 2k rpms or so.
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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06-06-2014, 10:19 PM
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CC Member
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Join Date: Mar 2003
Location: Wickenburg AZ- PHX, Cinci, Indy before,
AZ
Cobra Make, Engine: FFR Mk 3 408 530 - 585 T- mustang Dyno at B&R
Posts: 1,836
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Not Ranked
That sounds good. I always worry about low voltage with lights, air, two blade fans and small fans pulling air out of trunk. God help me if I turn on the radio!?  |
06-06-2014, 11:29 PM
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CC Member
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Join Date: Mar 2010
Location: Avondale,
AZ
Cobra Make, Engine: Factory Five Roadster
Posts: 484
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Not Ranked
Voltage
My new one-wire alternator puts out 13.8V without accessories on and 12.8V with headlights, etc on. Running Autometer volt gauge. I wouldn't worry about your voltage.
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06-07-2014, 03:57 AM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
Quote:
Originally Posted by Gofastoldguy
My new one-wire alternator puts out 13.8V without accessories on and 12.8V with headlights, etc on. Running Autometer volt gauge. I wouldn't worry about your voltage.
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How did you get a 1 wire alt to wire up?
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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06-07-2014, 05:30 AM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
I have 12.6 volts with the car off. 15 volts with the car running. Drops to 14.5 volts when the radiator fan turns on. 100am - 1G (3 wire) alternator with external regulator.
Never had a battery or electrical problem, but I routinely keep it on a Battery Tender when not being driven.
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06-07-2014, 06:10 AM
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CC Member
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Join Date: Apr 2009
Location: Phoenix,
az
Cobra Make, Engine:
Posts: 848
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Not Ranked
A no load voltage of 13.5 to 15.0 volts is considered normal.
A one wire alternator connects directly to a battery source.
__________________
_____________________
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06-07-2014, 06:42 AM
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CC Member
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Join Date: Dec 2004
Location: Kansas City,
KS
Cobra Make, Engine: jbl
Posts: 2,291
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Not Ranked
I get 15 volts while running with a 1 wire, haven't noticed any problems. Unlike the 3 wire, the 1 wire will discharge the battery if left connected.
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06-07-2014, 06:58 AM
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Senior Club Cobra Member
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Join Date: Jun 2000
Location: Gilford,
NH
Cobra Make, Engine: FFR 302 carb
Posts: 8,121
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Not Ranked
There you go.... Your good.
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06-07-2014, 07:49 AM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
Thanks everyone, I will consider it good and stick with the 3 wire.
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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06-08-2014, 04:46 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
15+ volts on the dash mounted voltmeter. 1 wire setup. With everything turned on, 13+ volts.
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