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09-07-2017, 06:47 PM
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#1 |
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Registered User
 
Join Date: Feb 2005
Location: Northeast--Bethlehem, Pennslyvania
Posts: 642
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100 AMP Alternator
Looking to replace my 63 amp alternator with a 100 amp alternator with V belts. Can I get one that will fit right into the stock brackets and bolt holes? I plan on running an electric fan. That should be the only draw on the system other then the normal things. The parts guy said i'll have to modify my brackets and maybe drill holes for the bolt. Thanks ,John
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Big Blue ( John ) 79 Chevy Pick up.....My Dailey STILL Working on a frame up: 1987 Truck body on a 78 Blazer frame. Need cab blasted to start project. Got the cab BLASTED, Now Prep and Paint. Started to lay SOME BONDO and primer. Done, Ordering paint. Got paint, Stuff painted,Cab,Fenders, Hood more later. 9/7/2015 Got the clear coat on,now time to take one off. Started to put things back (What a nightmare) like the heating and AC stuff,inside wire harness, outside AC unit and booster, still more. May 2016, still working on the inside. Got duck work in,heating and AC. Radio (stock) in dash with after market in console later, Speaker are hooked up, Steering column is in. Getting ready to drop the cab onto the frame, Working on engine now since I have the room. Well here it is 2018, got the engine in and it runs, now I need to get the exhaust system in so I can adjust the lifters, to loud right now. Got the exhaust on now I am waiting for the break parts to come in. |
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09-07-2017, 06:54 PM
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#2 | |
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Registered User
Join Date: Feb 2016
Location: Hebron
Posts: 1,153
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Re: 100 AMP Alternator
Quote:
I can't say for 100% fact, but I do believe as long as they are the same brand they should bolt up the same, BUT, are you upgrading your wiring? It would be my guess you'll need a larger gauge wire to the alternator than what you have now.
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 RUBBER DOWN AND HIT THE ROAD!!!1940 Ford Dlx Coupe 1969 Mach1 |
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09-07-2017, 10:21 PM
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#3 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,611
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Re: 100 AMP Alternator
If you are willing to settle for a 94 amp, then you can buy a drop in replacement assuming your current one is a 10SI.
Site with lots of info on subject: http://www.madelectrical.com/electri...elcoremy.shtml |
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09-07-2017, 10:36 PM
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#4 |
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Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: 100 AMP Alternator
If you want to upgrade to a CS alternator, grab one for a 1988 Olds Firenza 2.0 FI and swap pulleys. You will need to upgrade the wiring but its worth upgrading to a 90A CS vs a 100A SI because the CS alternator voltage regulator has a much faster response to changes in voltage fluctuations than the SI variety.
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09-08-2017, 03:11 PM
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#5 |
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Registered User
Join Date: Jun 2014
Location: CO
Posts: 749
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Re: 100 AMP Alternator
I just switched alternators in my Trans Am because I needed more amps at idle for AC and blower fan. Google 10si to CS130 and you will find plenty of info. The power windows going up and down would draw a lot of amps and you could see needle visibly move on voltage gauge. You need to buy a conversion wire 12.00 and then find a cs130 alternator which I found for 50 bucks 105 amps. I did not change any wires since alternator only puts out what vehicle needs and the wiring in TA is in good shape. The new alternator just laughs at amp draw of windows going up and down now. Best upgrade I made to the TA but dont think my truck will need this upgrade for a while.
https://www.hemmings.com/magazine/hm...s/3728021.html   
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79 Chevy 2wd BIG10 350 TH400 |
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09-08-2017, 05:21 PM
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#6 |
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Registered User
Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: 100 AMP Alternator
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09-08-2017, 07:58 PM
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#7 |
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Registered User
Join Date: Feb 2005
Location: Northeast--Bethlehem, Pennslyvania
Posts: 642
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Re: 100 AMP Alternator
WHOW,YOU GUS ARE GREAT. I did not plan on upgrading my wire. But if I have to then I will. It looks like the one from Summit is the one I can use. If I go that route do I still have to upgrade the wire? And the 94 one sounds like one I can use if I go also. I failed to mention that I will be putting electric door lock s and windows as well as a electric fan system. So I would like more amp then less. Again thanks for the great information and the quick response to my Question. That's why I stay here and learn.
Thanks John
__________________
Big Blue ( John ) 79 Chevy Pick up.....My Dailey STILL Working on a frame up: 1987 Truck body on a 78 Blazer frame. Need cab blasted to start project. Got the cab BLASTED, Now Prep and Paint. Started to lay SOME BONDO and primer. Done, Ordering paint. Got paint, Stuff painted,Cab,Fenders, Hood more later. 9/7/2015 Got the clear coat on,now time to take one off. Started to put things back (What a nightmare) like the heating and AC stuff,inside wire harness, outside AC unit and booster, still more. May 2016, still working on the inside. Got duck work in,heating and AC. Radio (stock) in dash with after market in console later, Speaker are hooked up, Steering column is in. Getting ready to drop the cab onto the frame, Working on engine now since I have the room. Well here it is 2018, got the engine in and it runs, now I need to get the exhaust system in so I can adjust the lifters, to loud right now. Got the exhaust on now I am waiting for the break parts to come in. |
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09-08-2017, 09:31 PM
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#8 |
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Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: 100 AMP Alternator
This is merely another option: I like to convert to a GM serpentine swap as seen in one pic and with that kit, I can add my 140A CS144 alternator adapter bracket kit to it to allow this massive alternator. I prefer tonuse the 94-97 Impala sS versions with my HD bracket kit. The stock setup is my father in laws 77 while the 140A alt is on my 86 K10 but I posted both pics to show a stock setup and an upgraded one.
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