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04-04-2008, 07:52 AM
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#1 |
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Registered User
 
Join Date: Jan 2006
Location: Warrington, PA
Posts: 403
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What size alt?
What size altenator are you running? I need to purchase a new one and was wondering if I should go with more amps. My current alt is 61 amp rating. I don't have air or electric fuel pump or fans. What amperage would you guys reccomend..thanks
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 69 C10 LWB GM 350 crate motor, 3.73 rearend
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04-04-2008, 08:06 AM
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#2 | |
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Gone to greener pastures
Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: What size alt?
Quote:
You now have my .02.
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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04-04-2008, 10:44 AM
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#3 |
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Lemme show you something!!
Join Date: Apr 2007
Location: St.Helens, OR.
Posts: 876
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Re: What size alt?
Being as you need to replace it anyways I'd go with at least a 100 amp model- you never know what sort of electrical do-dads you'll be inclined to add in the future, but at least you'll know the alt. is up to snuff.
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'67 CST-10 LWB ("Crusty") SOLD '67 GMC SWB ("Murdock") 2000 K1500 Suburban ("Betty") '95 BMW 325i ("Joy") |
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04-04-2008, 02:54 PM
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#4 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: What size alt?
61A is the largest alternator offered in these trucks and is more than adequate for a loaded truck.It is also the maximum windings that will fit the original case.I found this out when having my alternator built for use with a snow plow.I had the 49A and that highest rating he could get out of it was equal to GM`s 61A.You`d have to go to the later right-side alternator.When converting to the later two wire internal regulator type alternators you`ll most likely be jumping up in amp rating.I ended up using one from a 6.2 diesel which is 100A.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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04-04-2008, 09:53 PM
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#5 |
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Senior Member
Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: What size alt?
Just my personal opinion, but I would not go larger that around 60 amps or so because the wire to the battery is only 12 ga. If you had a really low battery I suspect a 100 amp charge would fry the wire or the fusable link (16 ga) that is supposed to be in there just before the battery.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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