[A81Sturmer]

I've had the weekend to think about this - and cruise the 924-944-968 forum & Clark's Garage. I did not find anything definitive but... it must be something that links the fans and the charging system, but does not affect the fans & the AC system - since the fans run anytime I hit the AC switch, whether the volts read 13.5 or 12 v. What could cause the volts to drop and the fans not to come on with the temp switch, but still come on with the ac switch? Anyone have anything more specific than a bad ground? Maybe a specific grounding point? It's an intermittant problem, so it's probably a wire or relay (probably a relay) that "works" sometimes but not others. AND when it doesn't work in also causes the volts to drop (and the battery to not charge). Suggestions?