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I have a 2007 Jeep Compass 2.4L with 4WD. The stock alternator has gone bad which I believe is a 120 AMP. I figured I'd upgrade while I was at it since I have added HID Lights and heated seats (among other things such as a system, off road lights, etc.). Well I spent the better half of the day trying to get the alternator back in (thanks Jeep BTW) and finally decided to compare the old one to the new one (120amp vs 140amp). Everything was the same except the circumference/diameter. The old one was around 15.125" in circumference. The new one being at 16" in circumference. What gives??? Can this truck not be upgraded to the 140 amp alternator that's offered? Any ideas? Thanks. JDJEEP123
 

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I would suggest u visit the junk yard and try to fit a used one, if I was you this my way
 
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