Yeah as V8Druid says wrong JD, my username is from a tractor rather than track loader. Also I'm from Lancashire and my names Matt. Easy to get mixed up when not using our own names like yourself.
You've solved your issue then. The switch should be momentary the silver box is a latching relay that operates based on a pulse from the switch to turn vibrate on. Then a pulse for "off". It isn't actually a relay inside the silver container I think its transistor or MOSFET driven, with a bit of signal conditioning.