Depends on how the switch fails. On a D1, I had the switch/light come one TOO often. But I could see if it gummed up inside, maybe it would never come on. If you unplug the switch, what happens? And then if jumper the harness plug?
Check the harness running down the left side of the block. Mine was rubbing on the exhaust manifold causing a short that was making my light come on. If this wire becomes open your light will stay off.
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