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Alternator/wiring question
#1604034
04/06/14 05:48 PM
04/06/14 05:48 PM
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Joined: Dec 2006
Posts: 1,178
Indy
FlyFish
OP
super stock
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OP
super stock
Joined: Dec 2006
Posts: 1,178
Indy
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My alternator is new, battery is new, but for some reason the alternator won't charge the battery. On of the easiest ways I can tell the alternator is not working is my Holley fuel pump is super quiet...when it is working properly the fuel pump is much louder..LOL. Any ideas?
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Alternator/wiring question
[Re: FlyFish]
#1604035
04/06/14 05:55 PM
04/06/14 05:55 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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What alt... is it a single wire or with a external regulator... if external, full field the reg... if it still doesnt work.. buy a alt.. but if it full fields and works then buy a reg 
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Re: Alternator/wiring question
[Re: MR_P_BODY]
#1604039
04/06/14 06:48 PM
04/06/14 06:48 PM
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Joined: Jan 2003
Posts: 344
Burlington, Ontario Canada
Dave_S
enthusiast
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enthusiast
Joined: Jan 2003
Posts: 344
Burlington, Ontario Canada
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You have to GROUND the field wire at the voltage regulator to full field the alt. The field wire is the one that does NOT have 12v volt (at the reg). you may simply have a bad ground at the regulator.
Dave Stillie
'73 Swinger
5.7 Hemi, 88mm turbo, powerglide, cal-tracs & 8 3/4
Mega-Squirt EFI
[email]8.93@149
[/email]
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Re: Alternator/wiring question
[Re: Dave_S]
#1604040
04/06/14 06:51 PM
04/06/14 06:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
You have to GROUND the field wire at the voltage regulator to full field the alt. The field wire is the one that does NOT have 12v volt (at the reg). you may simply have a bad ground at the regulator.
You are correct... I screwed up saying what I did...
I was thinking about something else ... I will correct it
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Re: Alternator/wiring question
[Re: Dave_S]
#1604041
04/06/14 07:00 PM
04/06/14 07:00 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
You have to GROUND the field wire at the voltage regulator to full field the alt. The field wire is the one that does NOT have 12v volt (at the reg). you may simply have a bad ground at the regulator.
Correct me if I'm wrong here... but I think the outside
wire on the reg connector is the field
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Re: Alternator/wiring question
[Re: MR_P_BODY]
#1604042
04/06/14 07:56 PM
04/06/14 07:56 PM
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Joined: Dec 2006
Posts: 1,178
Indy
FlyFish
OP
super stock
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OP
super stock
Joined: Dec 2006
Posts: 1,178
Indy
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So the voltage regulator could be the culprit? I replaced it 21 years ago....it might be due. I have a volt meter, but I'll be honest, I really don't know what I'm doing with it.
I had the alternator checked at autozone, it passed their test machine.
This is sad....I can build an engine no problem, but the smallest electrical issue and I'm stumped, heck, if I have more than 2 wires I get lost...lol.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Alternator/wiring question
[Re: FlyFish]
#1604044
04/06/14 08:31 PM
04/06/14 08:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
So the voltage regulator could be the culprit? I replaced it 21 years ago....it might be due. I have a volt meter, but I'll be honest, I really don't know what I'm doing with it.
I had the alternator checked at autozone, it passed their test machine.
This is sad....I can build an engine no problem, but the smallest electrical issue and I'm stumped, heck, if I have more than 2 wires I get lost...lol.
You can check the reg like said above.. ground the
field wire... I'm pretty darn sure its the outer one
on the reg... then see if you hear the alt load down
at idle.. or just replace the reg since you had the
alt tested... but I like to test my own junk
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Re: Alternator/wiring question
[Re: FlyFish]
#1604045
04/06/14 09:27 PM
04/06/14 09:27 PM
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Joined: Feb 2011
Posts: 1,454
Glendora Ca.
Just-a-dart
pro stock
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pro stock
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
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Flyfish how many wires go to your alternator 2 field wires or 1. It makes a difference on which regulator you have and how to test it.
Last edited by Just-a-dart; 04/06/14 09:29 PM.
"Just a Bracket car dressed up like a streetcar"
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Re: Alternator/wiring question
[Re: FlyFish]
#1604047
04/06/14 10:09 PM
04/06/14 10:09 PM
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Joined: Dec 2006
Posts: 1,178
Indy
FlyFish
OP
super stock
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OP
super stock
Joined: Dec 2006
Posts: 1,178
Indy
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I ordered a new regulator, it will be here tomorrow...hopefully that will do it.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Alternator/wiring question
[Re: Sport440]
#1604049
04/07/14 12:46 AM
04/07/14 12:46 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
Flyfish how many wires go to your alternator 2 field wires or 1. It makes a difference on which regulator you have and how to test it.
I have 1 field wire and the wire that goes to the battery.
What alt do you have? All the mopar alts have 2 field wires that I know of. Ones energized with 12 positive and the other goes to the reg which gets grounded through the reg. It doesnt matter witch post gets energized at the Alt. But the one thats not is the field that goes to the Reg.
But on the regulator, different story. The Top post is the 12 volt feed and the bottom side is the field wire coming from the alt side of the two fields thats not energized by 12 volts.
The alt needs a 12 volt feed as does the reg. The Reg Has to have a good ground to work.
If you have a Mopar Alt it should have three posts Two Field and one Bat.
So your saying you have One field and One Bat. Only two post connections on the Alt?
He has the old mech style reg and alt... it was a
single wire
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Re: Alternator/wiring question
[Re: FlyFish]
#1604052
04/07/14 03:06 AM
04/07/14 03:06 AM
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Joined: Feb 2011
Posts: 1,454
Glendora Ca.
Just-a-dart
pro stock
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pro stock
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
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I thought you would with the year of your car.
Like Ron said check for 12volts at the regulator, with the key "on" not running. If you have power there check to see if you have 12volts DC at the field connection. If you have power in but not out you have a junk regulator.
Normal system voltage should be a little over 12 not running, and around 14- 14.7 running
Have fun, Rod
"Just a Bracket car dressed up like a streetcar"
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