Re: Power master Alternator
[Re: stroked470]
#2703366
10/03/19 11:20 AM
10/03/19 11:20 AM
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Joined: Jan 2003
Posts: 15,540 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,540
Omaha Ne
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It is only showing around 12.6-12.8 at the battery at idle, if I rev it up it goes up to 14.3-14.5 but right back down at idle. This is with the fans off. This is normal and is due to the speed of the alternator / pulley ratios I have a new Power Master 17509 75 amp alternator to put on it but am I going to accomplish anything by doing this. Power master instructions also show to ground the extra field terminal. First question is what do the fans draw current wise? Then add headlights, A/C, and other things that cause a higher draw current wise. Now you have established what size (output wise) alternator will be needed. Once taht is established the next step is the wiring side of things v
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Re: Power master Alternator
[Re: stroked470]
#2703438
10/03/19 02:57 PM
10/03/19 02:57 PM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
enthusiast
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enthusiast
Joined: Feb 2011
Posts: 211
Halifax, VA.
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I have 100 AMP Powermaster alternator. I have SPAL 2700cfm electric fan, and A/C. With eveything on, including headlight, gauge shows little over 13. I do have it grounded with using a seperate 6 gauge battery cable. If I ever have to replace the alternator, I will go higher than the 100 AMP. Jack
K.I.S.S.
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Re: Power master Alternator
[Re: stroked470]
#2703464
10/03/19 03:57 PM
10/03/19 03:57 PM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
enthusiast
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enthusiast
Joined: Feb 2011
Posts: 211
Halifax, VA.
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Can't have too much ground. I didn't notice that PM recommended it, I just thought was good idea, so I grounded it.
K.I.S.S.
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Re: Power master Alternator
[Re: stroked470]
#2703765
10/04/19 11:07 AM
10/04/19 11:07 AM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
enthusiast
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enthusiast
Joined: Feb 2011
Posts: 211
Halifax, VA.
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I did put the PM alternator on. Im still not happy with it at idle. its around 12.8-13 volts at idle without anything turned on. with the lights on it idles around 12.4. if I give it gas it goes up fine. just not enough at idle. I started it with no ground on the field wire and it didn't charge at all. I put a 10 gauge wire on it and it started charging. do you know what the part number is on your alternator. My old 68 Charger had a painless harness in it I switched the alternator on it to a mid 90's truck 135 amp piece because of the huge fuel pump on it to feed the Procharger. Sorry, do not know the part number. It's been on the car over 10 years, maybe 15. Jack
K.I.S.S.
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Re: Power master Alternator
[Re: 383man]
#2703824
10/04/19 01:58 PM
10/04/19 01:58 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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Many racers put the larger alt pulley on for more hp but it kills the charging at idle. Ron large pulleys on racing cars keep bearings safer at high rpms
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Power master Alternator
[Re: NachoRT74]
#2703830
10/04/19 02:18 PM
10/04/19 02:18 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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per what I have read I think is good to let you know for those don't know: The need for ground one of the dual prongs alts to be matched to earliers charging systems is because both are isolated. Rotor needs to get both fields to be able to produce electricity. On earliers systems ( mech reg ) with one wire for field, this wire ( green ) provides a positive regulated source while the other brush is attached directly to chassis. this closes the field circuit to rotor. on dual prongs with two wires ( elect reg ), one wire ( blue ) provides constant positive from ign switch, while the other one ( green ) is now a negative regulated source. Hence the reason to be both isolated. There is somehow of myth about "one wire alts" being more efficient... false. is not because is a "one wire alt" but because the alt itself response better or not to the regulator or regulator is more efficient. stock look "one wire alts" are not that the same alt with a MOUNTED ON regulator. any of us can become the stock alt into a One wire alt just getting this regulator: which is available at several dealers. this uses just a ground source, positive source and is triggered to ON from a stator lead
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Power master Alternator
[Re: moparjack44]
#2703890
10/04/19 05:28 PM
10/04/19 05:28 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
pro stock
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pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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Do you by chance have the part number for this? I need to figure out if it will fit in the space I have for it.
eBay-cdwmotorsports
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Re: Power master Alternator
[Re: stroked470]
#2703893
10/04/19 05:31 PM
10/04/19 05:31 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
pro stock
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pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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My only tip to you about the PowerMaster Alternator is this. If you think the belt is tight make it tighter, they don't charge well with a loose belt. I had a "not charging" issue with mine, I tightened the belt and it helped. I think it could stand to be tighter. PowerMaster assured me that you can't get it too tight and it won't kill the bearings.
eBay-cdwmotorsports
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Re: Power master Alternator
[Re: cdwmotorsports]
#2703905
10/04/19 06:09 PM
10/04/19 06:09 PM
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Joined: Jun 2005
Posts: 5,112 Western Md.
skicker
"The Champ"
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"The Champ"
Joined: Jun 2005
Posts: 5,112
Western Md.
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FWIW I just changed out my Powermaster alternator (I think it was a 85 amp one) for a new 125 amp Powermaster. My car was doing exactly what yours is and finally started trying to charge all they way up at 16 volts...Lights dim at an idle but everything worked fine once off idle... With the stereo load I have when it is turned up I know the 85 Amp didn't keep up with the draw...I bolted the new 125 amp alternator on the factory brackets after making all new spacers on my 383. It's a world of difference...no more low charging at idle as the gauge reads a consistent 13.8 all of the time... The added amps allow me not to drain the battery while driving with the music cranked up... I think the bolt on voltage regulator on mine was bad since the alternator does still charge...That may be your issue also...
...FAFO...
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