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Thread: 4.0 YJ - Alternator is bad... whats a direct swap??

  1. #1
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    Post 4.0 YJ - Alternator is bad... whats a direct swap??

    Yes, I know, I am currently doing a search for this but it can't hurt to start a post on it and see if anyone knows what'll be a direct swap for my 93 YJ 4.0.

    Preferably with higher amperage.

    Thanks in advance

  2. #2
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    <font face="Verdana, Arial" size="2">Originally posted by Mascarab:
    Yes, I know, I am currently doing a search for this but it can't hurt to start a post on it and see if anyone knows what'll be a direct swap for my 93 YJ 4.0.

    Preferably with higher amperage.

    Thanks in advance
    </font>
    Nippondenso 90amp 121000-3400:

    1991-93 Chrysler Fifth Avenue 3.8L
    1990-93 Chrysler Fifth Avenue 3.3L
    1991-93 Chrysler Imperial 3.8L
    1990 Chrysler Imperial 3.3L
    1991-95 Chrysler LeBaron 3.0L
    1990-93 Chrysler New Yorker 3.3L
    1991 Chrysler TC 3.0L
    1994-95 Chrysler Town & Country Van 3.8L
    1990-93 Chrysler Town & Country Van 3.3L
    1994-95 Dodge Caravan 3.8L
    1990-95 Dodge Caravan 3.3L
    1991-95 Dodge Caravan 3.0L
    1997-98 Dodge Dakota 2.5L
    1991-93 Dodge Daytona 3.0L
    1990-93 Dodge Dynasty 3.3L
    1991-93 Dodge Dynasty 3.0L
    1992-94 Dodge Shadow 3.0L
    1991-95 Dodge Spirit 3.0L
    1991-97 Jeep Cherokee 4.0L
    1991-97 Jeep Cherokee 2.5L
    1991-93 Jeep Comanche 4.0L
    1991-93 Jeep Comanche 2.5L
    1992-98 Jeep Grand Cherokee 4.0L
    1991-98 Jeep Wrangler 4.0L
    1991-98 Jeep Wrangler 2.5L
    1991-95 Plymouth Acclaim 3.0L
    1992-94 Plymouth Sundance 3.0L
    1994-95 Plymouth Voyager 3.8L
    1990-95 Plymouth Voyager 3.3L
    1991-95 Plymouth Voyager 3.0L

    The Nippondenso 121000-4070 (might also be 4000, 4010, or 4030) I think is a 120 amp unit and can be found on pretty much the same vehicles depending on the electrical package they came with... Look for the ones with factory AC...

    Dave

    ------------------
    Green '97 TJ 2.5L
    Rubicon Express stickers,
    Superior Axle & Gear stickers,
    Tractech stickers,
    and stuff...
    Green '97 TJ with stuff...
    People are stupid...

  3. #3
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    What happened to the guy on Ebay???

    ------------------
    '89 YJ, 216,000+ miles (and climbing)!
    4" Superlift, Rancho 9000's, no swaybar.
    D30/D35 4.10 with Detroit in back, and Tru-Trac in front, Custom front and rear driveshafts, MIT CV kit.
    33" BFG AT KO's on 15" Procomp wheels.
    IPF headlights, PIAA driving lights, Optima redtop.
    Warn 9000i, 48" Hi-Lift with Rescue42 attachment.
    Canyon City rear rack.

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    <font face="Verdana, Arial" size="2">Originally posted by ukjeeper:
    What happened to the guy on Ebay???

    </font>

    Don't have $110 plus shipping, trying to get a junkyard fixer. I broke the tiny bolt off of my alternator that goes to the wiring and my voltage ranges from very low (9-10v) to 12-13v.

    I'd kinda be scared to wait the week or 2 it'd take to arrive though its my better deal no doubt, 165 amps dang....

    I live about 40 minutes from mr alternator so i may give that a shot.

    Thanks for the replies, I'm sure the junk yard has some of those!

  5. #5
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    What do this guy that seels them on ebay do to them? What can be done to increase the output of your stock alt? Is it the regultaor that has to be repaced?

  6. #6
    I love chite5c 89MJComanche's Avatar
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    <font face="Verdana, Arial" size="2">Originally posted by Mascarab:
    Yes, I know, I am currently doing a search for this but it can't hurt to start a post on it and see if anyone knows what'll be a direct swap for my 93 YJ 4.0.

    Preferably with higher amperage.

    Thanks in advance
    </font>
    In the time that it is going to take you to goto the JUNK YARD and Pull out that new alternator the guy at your local altearnator repair shop will be able to replace and rebuild your alternator with brand new parts and do it for less than half the cost of a used alternator that you dont know where it came from. I have bought brand new alternators at the autoparts store when I was in a jam and one time it lasted three weeks and then a bearing went bad that they probably did not change... MY alternator guy rebuilds the whole thing, bearings, winding, stator, relay, everything, unless he is 100% sure that it is just one component. The whole alternator rebuild only costs $10 in parts and I pay the guy about $30 to do the whole job... and I get higher amps if I want for free.


    If I wanted a Hummer I'd ask your sister.

    THE FLEET

    89 MJ PIONEER,95 XJ SPORT(5spd, Lifted, Locked), 05 LJ UNLIMITED RUBICON (6spd), 96 XJ SPORT(5spd, bone stock DD),
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    Sorry about the grammar in my pervious post, I was half asleep. In any case, what does this guy do to the alternator. Is it just a matter of replacing the internal regulator? I once spoke to an old Jeeper who told me that he tweaked his external regulator and got 120 amps out of his alt., I am currently working on a welder that will be powered by a 140amp alt. I have removed all the internal "controls" the alternator had. My experience with this project has lead me to belive that it is fairly simple to disassemble and rebuild alternators. Someone must sell a kit to boost up the output of a stock alternator. Anyone?

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    A couple things...

    A voltage regulator, oddly enough, regulates VOLTAGE. Not current. So bypassing, or modifying the voltage regulator will result in high VOLTAGE, NOT increased current.

    The ONLY way to get more current (amps) out of an alternator (by physics) is through increasing the windings. And this is not something you can sit in your basement and do (not the AVERAGE person).

    So....

    As I've said before in the alternator threads - your BEST BET for a high-amp alternator would be a Grand Cherokee LIMITED with the 4.0. 137A, and it shouldn't brake the bank. It's also not one of the high performance ones that require really high RPMs to output the advertised current.

    Matt

    ------------------
    1999 WJ 4.7L, stock for now
    1997 TJ SE, 4" TeraFlex, JKS discos, 32x11.5s on EA 15x10
    1989 YJ, built 258, AX-15/NP231SYE, SOA, 1.5" body, 2" add-a-leaf, 35x12.5 MTs
    1978 CJ-5, custom, fiberglass, ground up build, mild 304/T176/D300, 4.10s, 36x15x15s on chrom wagon wheels
    1988 YJ, 258/Peugot/NP231, 3" body lift (PO), and 33x12.5 MTs
    99 WJ 4.7L, loaded, Rubi MT/Rs
    97 TJ SE, 5.5" RK springs, Tera ACAs, JKS discos, 35 MTs on 15x10 Gamblers, 4.88s, Detroit Lockers, winch
    88 YJ 258/Peugot, 2.5" SOA, grsbl shkls, 35s, 8.8 rear, 4.10s
    89 YJ TJ 2.5l/AX5, 4" lift, 3" body (ugh!), 33" MTs
    78 CJ-5, custom, fiberglass, ground up build, mild 304/T176/D300, 4.10s, 35x15 TSL/SXs, custom dash, lots more

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