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  1. #1

    Default alternator size?

    Hey guys, quick question.

    I have a 95 chevy 1500, with a 305 ci engine. The altrnator went bad the other day i cant seem to figure out what the amperage is on it to order another one. How can i tell what it is? Also, what are the benefits or down falls with going to big or to small on the alternator amperage.

    Frederick, MD
    1995 Chevy truck
    223,000 miles and counting

    :fighting0098: chaos, panic and work here is done

    2007 Chevy Imp
    2006 Chevy Colbolt
    2007 Suburban
    1986 Camaro
    1996 Saturn
    1999 Saturn
    1996 Oldsmobile
    1995 K1500

  2. #2

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    It should be stamped on the cassing..I would say between 90 and 105 for stock... Do you have a lot of stuff running off your 12 volt system?
    Are you running a bigger Batt?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  3. #3


    When I run the RPO codes for my '05 the alt comes up as 145 your sticker still readable? I would guess around 100 amps for that age truck...
    Still Loyal to GM after all these years...:shocked:
    2006 Impala LT 3.5L
    2005 Silverado WT small cab/longbed 4x4 4.3L V6
    1999 Grand Am 3.4L in TX w/ our youngest
    1993 GMC Jimmy 4.3L 4 door 4x4 'Ole Rusty' - 'SOLD'
    1988 S-10 small cab/longbed HT3.4L Crate Engine
    1970 Nova 250 I-6, factory 3 sp floor shifter.
    1968 Chevelle 'Nomad' Wagon 250 I-6 w/ 3 on da' tree.

  4. #4


    The truck is bone stock with nothing extra running off of the 12v system, and i cant seem to read anything on the alternator itself. However, I looked into caddiacs idea about taking it to a rebuild shop and what do you know, theres one right around the corner from house!

    Needles to say, i'd rather support the local shop than buy some off shore crap from Auto Zone!

    Thanks for the help guys!

  5. #5


    Look at the SPI label in the glovebox for "Kxx" in my case, on both suburbans it's K68 - 105amp generator.

    Both suburbans were LS's - with rear a/c, power windows & locks, etc.... putting the K68 105 amp job into the truck. If I didn't have rear a/c or power everything, the alternator would be less amps.

    It used to be cost effective to rebuild alternators & starters. In some cases it still is.... but it's easier and almost cost effective to simply swap the old unit with a remanned from the local parts store. You'd rebuild components that aren't readily available or where you absolutely need the original case for authenticity. We just rebuilt the starter for a vette, cause my dads anal and into that sort of thing. $40. Vs. buying a new one for $55. Whatever. Rebuilding an alternator is not hard either as long as you put a toothpick in the thing to keep everything from exploding out when you open the case. And the rebuild stuff inside is probably as much as a reman.

    Just for ha-has' I just priced some stuff out.
    Remanned alt for 1999 = $121
    Stator and rectifer for same unit = $78 + 90.
    So it's cheaper to replace, unless you've troubleshot the thing and conclude it needs something cheap inside.

  6. #6


    Nasty Z28, your right on the money. its a 105 amp alternator and the price to rebuild the unit wasn't much cheaper than a reman from NAPA. Oh well, at least i know of another option if i need it down the road.

    Thanks for the help

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