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For the correct serpentine belt, it's probably asking you the amperage of the alternator, correct? Your best bet is to see if you can find any kind of part number off the existing alternator. Then take that number with you to a shop, and they might be able to find out the type of alternator you have. If you can't find any numbers, it makes life a little harder. What i'd do is try going to some online parts suppliers, like partsamerica, or rockauto. Look up the alternator and compare the pictures of the parts they have. Most times the different amped alternators will have different connectors, or look different all together. Thus allowing you to isolate the type you have. Good luck.

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Q: How do you know what alternator you have in your 1999 Suburban for purposes of buying the correct size of serpentine belt?
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