grounding the radiator

There are small electric currents than can be generated by coolant flowing through copper tubes inside a rad. This small current can cause an electro-chemical reaction called electrolysis. This causes internal corrosion and rotting of the tubes that basically eats away, plugs and destroys a rad from the inside-out. A grounding wire allows these generated currents to drain immediately and cause little to no effect.

 

Bruce from pp was on radio a few years back .. He mentioned the above also stated that it's a good idea to add a extra ground to frame and motor it can prevent most electrical problems and liner pitting from electrolysis as well where they come in contact with antifreeze made sense to me