Quote:
Originally Posted by Christ
The radiator is generally electrically neutral, being attached only by/through rubber grommets and holds. The engine is generally tied as a ground point, and the coolant flows through the block, which would essentially make the radiator a ground through a liquid conductor.
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I came across this potential difference in the coolant system a while back and I believe it is just the simple electrolyte battery principle, initially I thought I should earth my radiator, then after some careful consideration that if engine block is negative terminal and aluminium radiator core is positive terminal, by shorting the terminals I would my turn my radiator into a sacraficial anode, maybe not such a wise move.
That's why modern radiators are insulated from the body with insulators or plastic ends to the aluminium radiators.