Yes, I know many people use the
zinc. It's good insurance, but the source needs to be fixed, otherwise I'm just plating my engine/radiator with
zinc (I guess that's not a bad thing) and the radiator will fail eventually.
Yes, I'm surprised as well. I have thoroughly grounded with additional grounds with no change. But the meter doesn't lie, so I've got something wrong somewhere.
This isn't on my priority list right now. So you won't see anything results from me for some time. But I just wanted to remind people that it is real and to get theirs fixed now. I read plenty of posts here on the topic and never bothered to check the voltage in my radiator. Now I'm paying the price.