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Thread: Choice of Alternator (amperage)

  1. #1

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    Smile Choice of Alternator (amperage)

    I've a '90 Ram 50, 2.4L, Base model. Should I move up to a 75amp (I think it is) alternator from the 45amp I guess is in there now? Any disadvantages? And what steps can I take to ensure that I'm sent the the correct alternator (everything fits) when I'm ordering my new alternator.

    Thanks, people!

  2. #2

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    Sorry, I don't know the answer, but would also like to know the answer.

  3. #3




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    You can get an alternator from a starquest ( 75 - 100 amp) expo van (75 amp) or later monteros (75 and up)
    Pennyman1
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  4. #4

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    Though it may not be a direct bolt on, for my 4G63 I used one off of a first gen eclipse, if memory serves I looked it up for a 1990 2.0l (not sure if all that matters).

    Models that pennyman suggested weren't available without UPS shipping at the Napa where I worked (and could freely play with alternators), but the 1G DSM alternator was just a few hours away.

    I needed buy a super long bolt and make my own spacers, but it works well, has the same electrical plug, and is comes in 65 or 75 amp depending on whether it's for an auto trans. Also you have to swap the pulley if you're running v-belts.

  5. #5

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    I just got my truck back and I believe the alternator is done.

    i was planning on swapping it for a Mitsubishi van 75amp alternator, but no one has it in stock!

    I dont like like the idea of using the external regulator and bigger Dodge Ram alternator.

    i was going to take my alternator to the auto store to compare with a late model Montero alternator.

    can anyone confirm that the late model montero alternator is an option?? Specifically which year , model ( montero or montero sport) and engine?

  6. #6

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    FYI the montero sport v6 3.0 alternator does not work with the 2.0 g63b. The lower mount works, but the upper tension bolt does not align. You would need to fashion a longer bracket for it to work.

    Back to to the drawing board.

  7. #7

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    Thank you, pennyman1. And I apologize for my delayed response. Been ill.

  8. #8

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    I ended up ordering the 75 amp alternator for the van....hopefully it truly is a bolt in upgrade.

  9. #9

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    Dunno how useful this info will be, but the 3000GT alternator goes up to 110 amps for the VR4s and the loaded SL models. It doesn't look like it'd be a bolt-on swap for the 4 cylinders, but maybe it's possible to shoehorn the 3000GT guts into a 4 cylinder alternator casing.

    For anyone looking to power a whole lot of stuff, the Evo X alternator is 130 amps.

  10. #10

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    The 75 amp Mitsubishi van alternator was a direct fit and awesome upgrade for the same price as the factory 45 amp replacement

  11. #11

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    Quote Originally Posted by unc25 View Post
    The 75 amp Mitsubishi van alternator was a direct fit and awesome upgrade for the same price as the factory 45 amp replacement
    Where did you order it from?
    I knew daredevils and I ain't got nothin' against them, ........it's just they're all dead.

  12. #12

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    Quote Originally Posted by unc25 View Post
    The 75 amp Mitsubishi van alternator was a direct fit and awesome upgrade for the same price as the factory 45 amp replacement
    ^^^^^What Lon Moer said^^^^^^....

    What part of Georgia are you located?

  13. #13



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    Quote Originally Posted by unc25 View Post
    The 75 amp Mitsubishi van alternator was a direct fit and awesome upgrade for the same price as the factory 45 amp replacement
    The alternator is only a direct fit to the '87 and up Trucks. They changed the connector after '86. Though the '86 connector can be changed to be like the later years. When replacing stock with the Mitsubishi VAN or the Starion
    Last edited by BradMph; 01-29-2017 at 09:04 AM.

  14. #14

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    I ordered it from Advance Auto , they had it in "stock" at a local distribution warehouse and I had it sent to the house.

    Im in the Henry County area of Georgia.

  15. #15

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    Quote Originally Posted by unc25 View Post
    I ordered it from Advance Auto , they had it in "stock" at a local distribution warehouse and I had it sent to the house.

    Im in the Henry County area of Georgia.
    Sorry, but can you give us a little more detail, or a link?

    All I'm finding at Advance Auto have serpentine belt pulley's, not a v-belt pulley.; Advanced Auto
    I knew daredevils and I ain't got nothin' against them, ........it's just they're all dead.

  16. #16




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    just swap the pulleys on the alternators.
    Pennyman1
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  17. #17

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    http://m.advanceautoparts.com/p/carq...8a&showTitle=#

    That's the exact one I purchased.

    If all else fails, you can swap pulleys if the body of alternator fits.

    I took the old pulley off and turned the alternator in as a core without the pulley.

  18. #18

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    Thanks.

    Quote Originally Posted by pennyman1 View Post
    just swap the pulleys on the alternators.
    I tried that with an Eclipse alt. but it had a different shaft diam., so now I have a new useless DSM alt. on the shelf.
    Last edited by Lon Moer; 03-11-2017 at 01:27 PM.
    I knew daredevils and I ain't got nothin' against them, ........it's just they're all dead.

  19. #19




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    go to an alternator shop and have them find a v-belt pulley that fits the shaft.
    Pennyman1
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  20. #20

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    Hey guys! I know this is an old thread but my alternator died and I so I just found one of these Mits Van alternators from Orielly. I will try and install it tonight since my truck is daily driver. I hope it works and will post results!

    Thank you all for the useful info!

  21. #21

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    I installed the alternator and used the new pulley since it looked like the old one. But when i revved the engine the belt squealed. I had to go back to orielly to get the old pulley. After i got it back on, I hooked up the multimeter and got 14V. I ran down the freeway and it seemed like everything is working. I had to tap the sleeve to make it fit on the pivot. Here is the one I used: https://www.oreillyauto.com/shop/b/c...n?q=Alternator

  22. #22

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    Another option is to adapt a AC Delco 10si or 12si. I was able to do so on my G54B with a couple of spacers and brackets I made up. Still uses the same v belt. It's nothing fancy. I did also have to do a little cut and weld on the upper radiused bracket. The reason I went this route is that they are cheap (mine was $45 plus 15 if no core), reliable, and you can break down anywhere and get a replacement alternator. They are almost always in stock. Many of your extra high output alternators are based on the cases from these.
    I found this web page to have a lot of good info on the Delco alternators, and used it to find the one I wanted.
    http://www.madelectrical.com/electri...elcoremy.shtml
    Giovanni

  23. #23




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    Have the same Delco alternator on Geronimo, with beefed up internals. The alternator to use is a small case 10si/12si for a Buick / Oldsmobile. 105 amp output for the base alternator.
    Pennyman1
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  24. #24


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    I am running the one for an 87 Chrysler Conquest/Mitsu. Starion. I believe it is 75 amps.

  25. #25

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    Does the Montero have the same size shaft. I found a decent priced 110 amp alternator on eBay. I read somewhere that they do. But don't know if any specific year.

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