If your car is wired as it was from the factory (origional) then when you install a Fanzilla (and if Fanzilla is functioning properly) when a fan motor fails it LIGHTS the light. Normally the fan fail light will stay off. In the instalation instuctions that come with Fanzilla it explains how to test the fan fail light by removing each fuse in the unit which shuts down a fan simulating a dead fan and lighting the warning light. This is all assuming that the wiring in the car has not been modified except for the fan fail bypass if the origional fan fail relay is not still in the car. With the jumpers in the car you have lost the function of the fan fail light and I have seen myself a jumper burn up. Under severe conditions this could have lead to the loss of the car. At the least it can cause the motor to overheat and melt the relay block. The jumpers with fuses in them might at least self-destruct before they can damage the relay block. For more info go to deloreanparts.com David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote: > I'm running fused jumpers right now, but I want a Fanzilla. > > Why are they wired for the fan fail light to be ON, and the light to > go off when the fans fail? > > Rich > #5335 >