I think you will find the amp is 120. They used several different style alternator housings on the C4 models.
Both fans are the same size on the 90+ C4. The primary fan works off of engine temp and the reley is activated by a ground signal from the computer. Fan on temp is around 230, fan off is around 210 or so (don't exactly quote me on that-but it gives you the basic idea). The computer also uses vehicle speed to turn the fan off over a certain MPH to avoid excessive wear on the fan motors and electrical system. Those of you with C4s know this because after cruising down the road then coming to a stop at a light, you will sometimes notice the lights or dash lights to dim for a second. That is the primary fan cutting back on.
The secondary fan operates off the computer based on the a/c system. The computer will cycle that fan as needed to keep the condenser cool.
I would suggest you get the universal fan relay/themostat kit from Pep Boys. I can't remember the brand, but in my local area only Pep Boys sells it. The price is about $25. It comes with a temp probe you push into the radiator. It will cycle the fan on at 180, and off at 170. They have an adjustable temp kit for a few more dollars. I have used this kit on several retro fits with Zero defects.
