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Old 11-19-2016, 04:55 PM   #1
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PowerMaster Alternator Question

I want to replace/upgrade my alternator and poking around came across the "PowerMaster GM Original Look" Part # 47127 10si 100 amp Alternator. They also have a 85 amp one but for the 15.00 difference in price ( on Summit Racing ) I thought might as well have the 100 amp. Anyone using one of these and if so how it is working and how was the install ? Did you stay with externally regulated 3 wire or go to internally regulated 1 wire system.
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Old 11-20-2016, 01:04 AM   #2
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Re: PowerMaster Alternator Question

I have one, and it's the 100amp jobby. It works well and I have a three wire hookup. It was a simple bolt in.
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Old 11-20-2016, 01:09 AM   #3
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Re: PowerMaster Alternator Question

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Originally Posted by Rickysnickers View Post
I have one, and it's the 100amp jobby. It works well and I have a three wire hookup. It was a simple bolt in.
Thanks for the info. How long have you had it?
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Old 11-20-2016, 01:12 AM   #4
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Re: PowerMaster Alternator Question

Just a couple of months.
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Old 02-21-2017, 04:17 PM   #5
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Re: PowerMaster Alternator Question

Quote:
Originally Posted by Already Gone View Post
I want to replace/upgrade my alternator and poking around came across the "PowerMaster GM Original Look" Part # 47127 10si 100 amp Alternator. They also have a 85 amp one but for the 15.00 difference in price ( on Summit Racing ) I thought might as well have the 100 amp. Anyone using one of these and if so how it is working and how was the install ? Did you stay with externally regulated 3 wire or go to internally regulated 1 wire system.
Could you give a little more info on what it took to hook this up. Now I have a stock 61 amp that is externally regulated. P/N 47127 is internally regulated so what has to be done for the hook up and does the gauge on the dash work after the swap? My 61amp isn't keeping up like I would like to now that electric fans have been added.

Thanks
Keith
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Old 02-21-2017, 06:11 PM   #6
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Re: PowerMaster Alternator Question

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Originally Posted by hdff View Post
Could you give a little more info on what it took to hook this up. Now I have a stock 61 amp that is externally regulated. P/N 47127 is internally regulated so what has to be done for the hook up and does the gauge on the dash work after the swap? My 61amp isn't keeping up like I would like to now that electric fans have been added.

Thanks
Keith
I guess rickysnickers will have to tell you. I've changed my mind and am getting my original refreshed/refurbished by local starter/alternator guy.
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Success is Nothing More Than a Few Simple Disciplines Every Day..... Jim Rohn

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Old 02-21-2017, 06:21 PM   #7
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Re: PowerMaster Alternator Question

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I guess rickysnickers will have to tell you. I've changed my mind and am getting my original refreshed/refurbished by local starter/alternator guy.
were they able to increase the amp outpur anf did you use your original regulator. I was just out checking mine. at the battery with the motor running and nothin on it was showing 14.79, turned on the head lights and it went down into the 13's, then I turned on the ac with the electric fans and it went down to 11.75. the battery has been staying charged but I haven't been driving it long distances with everything on
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Old 02-21-2017, 06:51 PM   #8
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Re: PowerMaster Alternator Question

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were they able to increase the amp outpur anf did you use your original regulator. I was just out checking mine. at the battery with the motor running and nothin on it was showing 14.79, turned on the head lights and it went down into the 13's, then I turned on the ac with the electric fans and it went down to 11.75. the battery has been staying charged but I haven't been driving it long distances with everything on
Sounds about right to me. Have you done the headlight relay upgrade on your truck? I haven't had my original alternator done yet just went and talked to the shop owner. He said just use the original external regular as they are good forever.
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Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601

Success is Nothing More Than a Few Simple Disciplines Every Day..... Jim Rohn

"So often times it happens that we live our life in chains and we never even know we have the key"
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Old 02-21-2017, 07:25 PM   #9
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Re: PowerMaster Alternator Question

The OEM charging system routing is pathetic at best. Reproduction engine harnesses aren't much better since they mimic the GM design too. You should really upgrade the entire charging system to at least 1990's standard....internally regulated CS series and a single common 12V junction for all accessories...and running a heavier gauge supply lead for the interior would help a lot as well.
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Old 02-21-2017, 08:50 PM   #10
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Re: PowerMaster Alternator Question

Quote:
Originally Posted by gmachinz View Post
The OEM charging system routing is pathetic at best. Reproduction engine harnesses aren't much better since they mimic the GM design too. You should really upgrade the entire charging system to at least 1990's standard....internally regulated CS series and a single common 12V junction for all accessories...and running a heavier gauge supply lead for the interior would help a lot as well.
Well said G and I totally agree with you unless the truck is to be restored to totally stock condition. even for a totally stock truck an internally regulated alternator would be a huge improvement.

There's a limit on what can be done with the original alternator as far as upgrades. If you add more field windings for more amps you are reducing air flow for cooling so the alternator will run hotter and fail sooner.

If someone told me that the external regulators were good forever I'd question their sanity.

we have 100s of threads on the forum about the conversions and how to do them. Just type "alternator conversion in the rectangular box by your PM messages and tick the circle by 67 to 72 chevy trucks and then click google.
Then read away.
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