[Bryan Herbst]

Once again, what is telling you that the spike is not working?

When you say it isn't doing anything, do you mean that there is no light, or that the light is not changing color?

If there is no light, then it is a wiring problem. The relay is not connect to the PDB properly, the relay is not set properly (or is blown), or the PWM cable is not properly attached.

If there is a light and it is not changing color, then you know that it is a coding problem.

As for digital output- no. If the fan is attached to a spike, then the PWM cable should go to a relay output on the side car, and you should use the relay code.