How can you tell if the alternator on a 2002 Tahoe 5.3 l is 105 amps or 130 amps?

There's no easy way to visually distinguish between a 105-amp and a 130-amp alternator on a 2002 Tahoe 5.3L without removing it and checking the label. The external casing is often very similar.

Here's how you can find out definitively:

1. Check the alternator label: Once you remove the alternator, it will have a label with its specifications, including amperage output. This is the most reliable method.

2. Check the part number: Find the part number stamped on the alternator itself. You can then use that number to search online (e.g., on parts websites like AutoZone, Advance Auto Parts, etc.) to determine the amperage. Be sure to use the correct part number from your specific alternator.

3. Check your vehicle's wiring diagram: A detailed wiring diagram for your 2002 Tahoe 5.3L might specify the alternator amperage used in that model year. This is less reliable as variations may exist due to options and build date.

4. Check your owner's manual: While unlikely, your owner's manual *might* list the alternator's specifications. This is a long shot.

In short, removing the alternator and examining the label is the most straightforward and accurate way to determine its amperage rating.