Hello, I recommend John Hervey's Fan Fix. It simply plugs in like the fanzilla. I have been using one for about 10,000 miles now and I have had no problems. My volt gage barely moves when I have the AC/ lights etc on.(original alternator too) The Fan Fix was one of the best upgrades I did for my car. The Fan Fix also illuminates the "fan fail" light on the dash when the fans come on if you want it to which I think is a nice feature. peace Dave 6286-stuck in storage;( [Non-text portions of this message have been removed]