Keep in mind, the Crown Vic fans were also used in police package cruisers too-a 140 amp alternator is all you need. I build cooling fan systems and among the kits I build include using several versions of Motorcraft 2-speed fans. I've measured amp draws of 18-21 on low speed and 26-30 on high. That is nothing crazy-a 140A alternator like the one I use have no issues maintaining the charging system. You don't need a 200A alternator-heck police cruisers never needed one and they run way more than an HO fan.
If you step up with a HO alternator you must upgrade the wiring to support it....and that means more than an adapter plug. I'm just trying to keep you from spending big $$ on an alternator you don't really need IMO.
Don't get me wrong, I'm sure those guys can build a helluva alternator but they don't design/build system management harnesses. Did they tell you how to change your existing system wiring to take advantage of the remote voltage system? Did they suggest running at least a 4ga charge cable to a common junction? You can't triple or quadruple the amperage capability of an alternator and still choke it all through stock wiring. I'd be curious to know how you have your Crown Vic fan wired-before buying a huge alternator, I can help suggest some changes that may solve your voltage problem. Even a 105A alternator should easily handle that RF124 CV fan.
