Powermaster 12-si 100-amp Alternator Experiences

Discussion in 'Sparky's corner' started by Dan Gerber, Jul 8, 2019.

  1. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Hey guys...

    The trusty Delco 10-si series alternator on my '72 Skylark 350 (with A/C) has seen better days, so I'm considering a Powermaster 12-si style 100-amp replacement alternator. Have any of you had any bad experiences with the Powermaster product (either their 100 or 150-amp models)?

    Background: The 10-si alternator in my car produced a true (i.e., verified by testing) 85-amps a few years ago, but it's now getting a little noisy. Plus, since I'm installing a warmed over 482" BBB that I hope to equip with a Holley Sniper self-learning FI, I just might need to install an electric auxiliary cooling fan to help the stock cooling system now and then.

    The M&H reproduction wire harness that I installed way back in the 90's when I built up the 350 included an "external to internal regulator conversion" and a couple other minor mods, which continues to work very well. I will, however, install a new M&H wire harness for the new BBB.

    So, your experiences with a Powermaster 12-si style alternator???

    Thank you in advance for your help.
     
  2. 2001ws6

    2001ws6 last of the v8 interceptors

  3. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Thanks for your response, 2001ws6.

    What electrical components are installed that you feel you need 150-amps?

    Was it necessary to run a larger gauge charging wire?
     
  4. 2001ws6

    2001ws6 last of the v8 interceptors

  5. Bens99gtp

    Bens99gtp Well-Known Member

  6. Dan Gerber

    Dan Gerber Platinum Level Contributor

    Anyone else with a Powermaster 12-si style alternator?
     
  7. Darron72Skylark

    Darron72Skylark Well-Known Member

    I’m about ready to order one, but haven’t yet
     

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