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

You can't determine the exact alternator size solely from the year of your 1999 Suburban (or any vehicle). Suburbans of that year came with various engine options, and even with the same engine, different alternators might have been used depending on the trim level or optional equipment. The alternator's size directly impacts the serpentine belt routing and length needed.

To find the correct serpentine belt size for your 1999 Suburban, you need to do one of the following:

1. Check the old belt: The easiest way is to look at the old belt itself. The size is usually printed on the belt itself (e.g., "6PK2240" or similar). This is the most reliable method.

2. Check the sticker under the hood: Many vehicles have a sticker under the hood listing recommended parts and specifications, including belt size. Look for a sticker near the radiator support or on the underside of the hood.

3. Consult your owner's manual: Your owner's manual should list the correct belt size for your specific engine and options.

4. Use a vehicle identification number (VIN) lookup: Online parts stores (like AutoZone, Advance Auto Parts, Napa Auto Parts etc.) allow you to enter your VIN. Their databases can then show you the correct belt size based on your specific vehicle configuration. This is a very reliable method.

5. Check the alternator itself: The alternator usually has a part number stamped or printed on it. You can then use this number to search for the correct belt size online or at a parts store.

Avoid guessing. Using the wrong belt size can lead to premature belt wear, belt slippage, or even damage to the alternator or other components. Always use one of the methods above to determine the correct size before purchasing a replacement belt.