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I was under the hood (dangerous place for me) of my Supra, and when I went to disconnect the neg- connector from the battery terminal one of the wires broke right off. I jury rigged it back on with a washer and bolt, however I was curious as to what it was. I tested starting the car with and without it and I did not notice anything wrong, started w/ all electrics seemingly fine.

Two wires run off the neg- on the battery terminal. The broken wire is heavy gauged and runs down the inside of the engine bay and I believe to the starter. The other one which is fine, though feels very brittle connectors to a bolt on the side and carries on it's merry way.

I looked over the online repair manual, but well mostly a car nub here. =)
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