Can someone help? I need to drive my dart tomorrow

Shaun65dart said

Ok the brown wire that was unidentified alongside the valve cover has now been traced. It is actually a grey wire that travels with the green, purple, two blue, and black wires. It is for the oil pressure switch which is no longer in action because an aftermarket mechanical gauge is being used

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OK. If its for a low pressure switch, then it may carry full voltage or may be 5 Volts because of an instrumention voltage regulator. Either way, hook it back up - even if the switch is dead, or cover the connector real well and secure it. Don't want those hot loose ends touching ground.

The odd thing to me is you measured 6 Volts on it before. But for now I'm not too concerned about it. I'm pretty sure you're correct and don't think it was being used as a jumper or anything.