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Hi all, I just had an alternator shop look at my alternator because 1) I want to see if the transmission's hard shifting is related to a bad alternator, and 2) I am going to install a battery in the back of the van for vandwelling and one of the ways in which I will charge that battery is by a 20amp battery-to-battery charger made by Renogy, so I want to be sure my alternator is up to the task. When we first started the engine, the alternator was putting out up to 14.8volts, but after a minute, it went down and stayed around 13.3-13.4. When I kicked on the AC and brights, it dipped to 13.0 for a half-second and then went back to stay at 13.3-13.4. The guys at the shop were not able to say whether the alternator is definitely faulty or perhaps is made to behave this way. So I am putting the question on this forum before spending $235 to have them rebuild the alternator. Thanks for any input.