Definitely get a brand new oem alternator. Rebuilding them is always dicey and a lot of times they don’t last. I don’t advise anybody to get aftermarket ones unless you know for sure that it is the same brand name that was put on by the factory. Now the other thing you wanna also do if you haven’t done so recently is replace the battery or if it’s fairly new you can recharge it. But you want the charging system to be properly balanced so that it will work correctly. Also another thing you wanna do if you find that you’re having problems with alternators is check for bad grounds and any shorts or frayed electrical wiring as this will contribute to continuous alternator failures. Hope that helps!