I tested the fan today directly from the fan to the battery. It seems there is a short somewhere, because the fan worked in both speeds. Interestingly, though, it seems both speeds are running at the same speed (judging by sound; I can run it through my watt meter to be sure later on), but I dont mind. I just need 2 positives so that I can connect the automatic controller to one and the relay to the other as backup. The finding does mean that I have to re-wire the fan next week, though.
But now I have a new question; I went to refill the Jeep with gas (Air Conditioner), and the guy told me that it seems the air flow over the condenser is not enough with only the fan. I think the fan is taking air through the gap between the radiator and the condenser. Is there some sort of weather strip that can handle enough heat to put between the condenser and radiator so that the air flow is forced to go through the condenser?