Hi Chris, I'm glad to assist you. You can be able to see the rating on the labeling on the alternator itself. You can also check that on your car owner's manual as well. There are also DIY tests shown on other video-sharing websites to get the alternator rating. Still, for us to be accurate, please provide the complete information of your vehicle (year, make, model, submodel, and engine size). The 17-character VIN would also be very helpful. I hope this helps. Happy shopping.