Actually, you need to pulse to turn the amps on, and a separate pulse to turn them off.

Odd protocol, to say the least.

I was able to do it with an electrolytic capacitor, a couple of relays, and a power supply, but it was kind of ridiculous that I had to go through the effort.

Not sure how you got that Xantech module to work, as it would only supply the on pulse, not the off pulse. How did you handle that?