Alternator only put's out 13.3 Volt at high rpm

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    Author Topic: Alternator only put's out 13.3 Volt at high rpm  (Read 3692 times)

    Offline widing'cuda

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    Alternator only put's out 13.3 Volt at high rpm
    « on: September 24, 2015 - 11:46:25 AM »
    I think my  alternator is busted, it olny out puts 13.3 volts when i rev the engine high. So Sadly the battery is now only 11.8 volts  :walkaway:
    On ideal the  alternator puts out 12.6 volts. And when I start the engine i need to rev it to 1500 rpm before the  alternators starts to work. It's a Powermaster 90amp. Cable wiring from YearOne all over the 'cuda. The  alternators has like top 5-4000 miles on it and is only and it use to put out 13.8 volts on ideal. Is Tuff Stuff  Alternators a better choice the Powermaster? As I guess I need a new  alternator  :stomp:
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    - Jørgen - Norwegian Mopar fanatic

    1970 Plymouth 'Cuda 383 A833 8-3/4 3.23 suregrip
    http://cuda.widing.biz/


    Offline widing'cuda

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #1 on: September 24, 2015 - 12:03:58 PM »
    I believe it's this one
    http://www.summitracing.com/int/parts/pwm-75191/

    I found the paper for it. I got it back in july 2007 So I guess 10.000 miles then
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    - Jørgen - Norwegian Mopar fanatic

    1970 Plymouth 'Cuda 383 A833 8-3/4 3.23 suregrip
    http://cuda.widing.biz/

    Offline TonyBolton

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #2 on: September 24, 2015 - 12:28:32 PM »
    www.Mechman.com would be my first/only choice.

    These are the real deals....no rebadged China junk.
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    Offline widing'cuda

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #3 on: September 24, 2015 - 01:27:28 PM »
    Quote from: TonyBolton on September 24, 2015 - 12:28:32 PM
    www.Mechman.com would be my first/only choice.

    These are the real deals....no rebadged China junk.


    Thanks for the link
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    - Jørgen - Norwegian Mopar fanatic

    1970 Plymouth 'Cuda 383 A833 8-3/4 3.23 suregrip
    http://cuda.widing.biz/

    Offline TonyBolton

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #4 on: September 24, 2015 - 01:29:28 PM »
    They are also good for tech support as well.
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    Offline widing'cuda

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #5 on: September 24, 2015 - 01:30:58 PM »
    Did some more measuring and found out I have 14.1 volt at the alternator, but only 13.3 at the battery at ideal with the headlights turn off. So I guess I have some faulty wires/ to much resistant in the wiering . Should I rune a positive cable directly from the battery to the alternator? How large should it be?
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    - Jørgen - Norwegian Mopar fanatic

    1970 Plymouth 'Cuda 383 A833 8-3/4 3.23 suregrip
    http://cuda.widing.biz/

    Offline Cudaragtop

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #6 on: September 24, 2015 - 04:54:33 PM »
    I added a high quality #8 AWG wire with a fusible link from the Alt output to the starter relay. 

    If you want to do the "Full Bypass" of amp gauge this is the best explanation I've seen. Lot's of other good stuff too.
    http://www.madelectrical.com/electricaltech/amp-gauges.shtml
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    - Randy D.
    1 of 88 1970 340 4-Speed 'Cuda Convertibles
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    Offline brads70

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #7 on: September 24, 2015 - 05:18:06 PM »
    I'm using this alternator and am happy with it ! http://www.qualitypowerauto.com/item_557/Chrysler-Mount-Mega-Amp-Alternator.htm

    I got rid of the amp gauge and ran a heavy wire from alternator to battery. Sounds like your alternator is putting out but can it keep up with any electrical non stock add on's? ( If you have any? )
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    Brad
    1970 Challenger 451stroker/4L60 auto OD
    Barrie,Ontario,Canada
    Proud to own one of the best cars ever made!!!!!

    My restoration thread 
    http://www.cuda-challenger.com/cc/index.php?topic=59072.0
     My handling upgrade post
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    Offline widing'cuda

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #8 on: September 24, 2015 - 07:09:46 PM »
    Quote from: Cudaragtop on September 24, 2015 - 04:54:33 PM
    I added a high quality #8 AWG wire with a fusible link from the Alt output to the starter relay. 

    If you want to do the "Full Bypass" of amp gauge this is the best explanation I've seen. Lot's of other good stuff too.
    http://www.madelectrical.com/electricaltech/amp-gauges.shtml


    What size fusible link would you use, 8 AWG? I know how they work, but here in Norway, we only use fuses as fare as I know. So i just have to ask
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    - Jørgen - Norwegian Mopar fanatic

    1970 Plymouth 'Cuda 383 A833 8-3/4 3.23 suregrip
    http://cuda.widing.biz/

    Offline dodj

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #9 on: September 24, 2015 - 08:39:04 PM »
    Quote from: widing'cuda on September 24, 2015 - 07:09:46 PM
    What size fusible link would you use, 8 AWG? I know how they work, but here in Norway, we only use fuses as fare as I know. So i just have to ask
    I use an 80 amp MANL fuse.  :2cents:
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    Scott
    1973 Challenger  440 4 spd 
    2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
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    Offline Chryco Psycho

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #10 on: September 24, 2015 - 10:10:23 PM »
    the question is why run a fuse between the alt & start realy you have battery voltage at both ends !
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    Offline Cudaragtop

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #11 on: September 24, 2015 - 10:13:59 PM »
    Quote from: widing'cuda on September 24, 2015 - 07:09:46 PM
    What size fusible link would you use, 8 AWG? I know how they work, but here in Norway, we only use fuses as fare as I know. So i just have to ask

    8 gauge main wire (AWG= American Wire Gauge). #12 gauge fusable link. The fusible link is just a short piece of wire that is used like a fuse so it is a much smaller gauge wire. Your Mopar should have one already connected to the starter relay. looks like this.


    Member crackedback offers a bypass wire kit that is premade with #8 main wire and #12 fusible link if you want one stop shopping.
    http://www.cuda-challenger.com/cc/index.php?topic=105813.60
    I made my own. #8 bypass with #12 fusible link.
    I bought one crackedback's Headlight Relay kits. (y) Many on here have. Very well made.

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    - Randy D.
    1 of 88 1970 340 4-Speed 'Cuda Convertibles
    69 Barracuda Fastback Project Album https://goo.gl/photos/XjsAsx4LDo7psimU8
    ----o00o--'(_)'--o00o----

    Offline crackedback

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #12 on: September 27, 2015 - 01:08:01 AM »
    Quote from: Cudaragtop on September 24, 2015 - 10:13:59 PM
    8 gauge main wire (AWG= American Wire Gauge). #12 gauge fusable link. The fusible link is just a short piece of wire that is used like a fuse so it is a much smaller gauge wire. Your Mopar should have one already connected to the starter relay. looks like this.


    Member crackedback offers a bypass wire kit that is premade with #8 main wire and #12 fusible link if you want one stop shopping.
    http://www.cuda-challenger.com/cc/index.php?topic=105813.60
    I made my own. #8 bypass with #12 fusible link.
    I bought one crackedback's Headlight Relay kits. (y) Many on here have. Very well made.


    Thanks for the recommendation.

    Sounds like you have very high resistance in the charge line.   If the wiring is all stock, wire sizing and every connection in line creates a resistance point and induce voltage drop.   I just made 4 of the bypass assemblies for customers, they work well.   
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    Offline dodj

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #13 on: September 27, 2015 - 07:42:40 AM »
    Quote from: Chryco Psycho on September 24, 2015 - 10:10:23 PM
    the question is why run a fuse between the alt & start realy you have battery voltage at both ends !
    I thought the same. Then a few years ago I saw a pic on this forum of an alternator O/P stud that came off the alternator body. Without the fuse, a fire or battery rupture would be very possible. I think Goody posted the pic.  :2cents:
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    Scott
    1973 Challenger  440 4 spd 
    2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
    Good friends don't let friends do stupid things. ........alone.

    Offline Katfish

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    Re: Alternator only put's out 13.3 Volt at high rpm
    « Reply #14 on: September 27, 2015 - 12:51:31 PM »
    Yep, extra measure of safety in case of a dead short.
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