I have a 08 f350 and my battery light has been coming on and off for a few days but my gauge never moved. The other day my gauges all shut off and turned back on a few times showing the abs light and battery light and my battery Gauge would spike to Max. Did this 2 or three times in a matter of 3 minutes. I had the alternator checked an batteries and they all checked out. The mechanic said it's my tuner ( mini maxx) and it's over charging my battery. I called h&s and they said theirs no way it could do that. HELP!?