My 1998 xe began having problems keeping the battery charged in 2015, replaced alernator. Then in 2016, it worked, but not constantly. We ran it thru the tests with gauges several times, always passed except 1 time, it was charging around 14v, and went DOWN when I reved the engine, and then was fine again. Eventually, I set up an analog volt meter inside, and could see it often NOT charging above 20mph or so, but would slowly come up to 14v at idle. Eventually, it rarely charged, usually reading 11v or less. Replaced July 2017. Lasted 30 days until same problem, but would not consistently charge at idle. Went thru volt drop tests from remans tech support, swapped under warranty again in October, that 1 lasted 15 days. Plus, #2 that would NOT charge in the truck DID charge on their bench. PepBoys wanted me to have Penn Diagnostic center test the truck, but the owner told me it was PBs junk remans. I sought another mechanics opinion, and he does not beleive I could have gotten 3 bad alts in a row. According to schematic, it is a simple charging system, yet, this ghost hides in it. Has anyone else had a similar issue? The instrument cluster was repaired by Mr. Whizard in Dec 2014, but could that cause the system to not work? It is tiresome to carry 2 xtra batteries plus a charger constantly.