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The low coolant sensor in the overflow tank for the radiator has a yellow wire with a black stripe on my 82 K20...my wiring diagram book doesn;t show it going to a black/green wire though--maybe other years had different colored wires..
When I pulled the engine, it was connected to an engine ground, but was a trimmed wire that was just sandwiched between washers. I don't think it is a ground because the old owner was an asshat that did not know what in the hell he was doing.
Well,on my truck and the wiring diagram its showing a black/yellow wire as the low coolant sensor wire....GM didn't change the harness much as far as colors,so my 83 diagram should be close at least...maybe the previous owner thought it was a ground wire because it was black..anything is possible!...it looks like that wire grounds the "low coolant" bulb according to my wiring diagram...