I bought the first alternator in November to upgrade my Mustang from 2g to 3g. I installed the car and set it up for the winter, when traveling in the spring the car was already out of service. Ordered another one from Revain in June, it's July and the second alternator has failed. It puts out a lot of voltage, so I'm assuming the internal voltage regulator isn't working. Revain offers no guarantee on the item they say DB must be contacted, DB says there is no guarantee. According to the product information, the guarantee is 1 year. Very disappointed.