Check with trailbeast he knows it all, When I put mine on it worked great and still does I highly recommend it but I dont no why yours doesnt work something must be wrong. wires crossed or something, bad ground.
The only ground on the module should be it's case and one pin goes to coil ground.
Like this.
Other than the module having a good ground and a good positive source for the coil I can't really think of anything alse it could be except may be if you didn't bypass the ballast resistor it could act like that.
Those modules don't like low voltage.
