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#1 |
Registered User
Join Date: Sep 2014
Location: Johnson City TN
Posts: 311
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Alternator Replacement Question
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#2 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,394
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Re: Alternator Replacement Question
I used a later model 64(?) amp Delco 10si internally regulated alternator. Is bolt on and with a few very simple wiring mods it by passes the external regulator system that the O.E. unit uses. They can be found on square body trucks amongst many other applications. They are readily available at the local parts stores.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's Last edited by 57taskforce; 02-21-2016 at 09:01 PM. |
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#3 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Alternator Replacement Question
I generally take an opportunity like this to convert to an internally regulated alternator, but if this one was meeting your needs before it failed, just get the direct replacement at your favorite parts store. Don't change anything.
If it -wasn't- putting out enough for your truck, read up on the conversions. Stay away from the seduction of "one wire alternators". You lose a number of features, like the idiot light, field excitation, and so on. You have to (usually) rev them up to get them to start charging the first time too.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#4 |
Registered User
Join Date: Feb 2016
Location: San Diego California
Posts: 41
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Re: Alternator Replacement Question
I would just get the OE replacement from your nearest auto parts store. I'm running one and it is working just fine on my 72.
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#5 |
Registered User
Join Date: Sep 2014
Location: Johnson City TN
Posts: 311
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Re: Alternator Replacement Question
One last thing, is it possible the voltage regulator is bad and causing the alternator to put out a low voltage? Is there a way to check that separately?
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#6 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,249
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Re: Alternator Replacement Question
I'm replacing my perfectly good alternator for one internally regulated. Unfortunately I'm still using the one I have. Don't know about the wiring, but it doesn't matter anyway, because I'm replacing all that too.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#7 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Alternator Replacement Question
Most auto parts stores can bench-test an alternator. If it's fine, then I'd suspect the regulator.
Growing up on the prairies where the next "big town" can be 6 hours away we used to carry spare belts, water pump, regulator, alternator, and fuel pump. Those are the "maintenance" items on a GM of that era.
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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