Still unable to get this working properly. For whatever reason, with +12V and proper grounding, its not working. However, when I put -12V to several of the terminals, it closes and then pulses periodically. I'm not sure at this point what is going on.
It may run through a data line. Most of these type of units use data to turn on and off, could even just be a simple 6V like ford amps. Mitchels is probably the best solution.