Short in wiring on Weber 670 grill station

I have a short in the wiring on my Weber 670 grill station. Does anyone have a wiring diagram on hook ups. If you hit it or close the lid hard the lights come on. I know it is an intermittent short but hard to find the low voltage wiring.

should be pretty easy - all the clunky parts (lid, shelves, cook box, frame) are the ground, the button is the "hot". This may not be particularly helpful

>>>edit: a better explanation may be that the entire grill is the ground other than the center button/contact on the ignitor electrode & switch.

Someone here may have the diagram..........