[RESOLVED] What is this?

[darkiller_666]

i was going through my engine bay to help determine the cause of some problems ive been having and i found this. When i take it off the wires and shake it, it rattles loudly. I tried checking the prongs on the back side with a multimeter and there was no continuity through any of it. Does anyone know what it is?

 

[turbosax2]

It's the generator relay.

http://www.dsmtuners.com/forums/newbie-forum/152883-sensor-next-2-bcs-need-know.html