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  • alternator replacement questions

    im not even sure this is the right section but it looked good enough. ive got a 1999 2.0 se auto contour. the alternator still puts out plenty to charge the battery and all but I have a small system. im running a 1200 watt amp & a single large 10" sub. when the bass hits of course the lights dim. they also dim when I roll the windows up or down. I think the factory alternator is a 130 amp? & that's if the car even still has the factory alternator. I just turned 249,000 miles last week. I have a brand new oreillys Ultima alternator ( https://oreillyauto.com/detail/ultim...our?q=n111976a ) that's only rated for 105 amps.


    I was curious if I installed this new alternator if just maybe the dimming would go away or not? ive heard to get a capacitor but I don't have much experience with capacitors.
    Last edited by silverskoundrel; 08-24-2017, 12:21 AM. Reason: edited because i found out the alternator is contour specific

  • #2
    No that won't fit. The alternator for the Contour is different.
    https://oreillyauto.com/shop/chargin...Attr_10040=130 - 139 Amps

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    • #3
      The alts interchange as the engines are the same, the amp rating is different though. Depends on the diode plate (6 or 8) and regulator used.

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      • #4
        well darn. glad I didn't tear it down and try to put it on

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        • #5
          im gonna check the part number on the one I got when I get home.

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          • #6
            Alright so I was wrong. I looked at the alternator I have and it's the one that fits the contour so yay! I guess back to the question. Would changing the alternator to this new alternator keep my lights from dimming any? Lol

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            • #7
              Probably not. You won't eliminate all dimming unless you invest in a second battery and isolator setup to separate the amp from the cars electrical system.

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              • #8
                Originally posted by cclngthr View Post
                Probably not. You won't eliminate all dimming unless you invest in a second battery and isolator setup to separate the amp from the cars electrical system.

                do you have to run a higher amp alternator if you add a 2nd battery?

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                • #9
                  Originally posted by silverskoundrel View Post


                  do you have to run a higher amp alternator if you add a 2nd battery?
                  No. The stock alternator is fine, but I suggest getting a better main battery with a higher amp capacity and have the second aux battery the same and use an isolator with it.

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                  • #10
                    With the isolator, you do need to match the alternator output as close as possible to the rating to the isolator,

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