who owns/uses a LM_2?

I use an LM1 on my Duster. Works great, never had an issue with it.

The grounding is SUPER important. There's a computer board and sensitive electronics in there, and they need a good ground to function properly. The 12v source also has to be a good one, if I recall correctly it's supposed to be on its own circuit. I would make sure it's well grounded, all the connections are good (as in soldered, no cheap crimp connectors) and that it's getting constant 12v power.