well thats an excellent question , who would you call a reputable source ?
Being an ozzy , I have no idea so let me know who is one!
Its mounted on the inner guard much where the factory ram one is located and ive been through the pins in the plugs over and over again because I had the same thought.
I will run an external earth from my earth point to the battery and see if that helps.
The earth lug is a big soldered on affair so I may even cut that off and solder another one on just to be sure they are all connected properly.
