Electrolysis can be caused by a blown head gasket. I chased electrolysis on a car for months and it dissolved 5 heater cores. GM had me doing all kinds of stuff from flushing the cooling system with baking soda to soldering grounds onto the heater core and radiator and adding new grounds to the block. What it came down to was a blown head gasket that would let exhaust gas into the system but wasn't bad enough to burn coolant.
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