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Last time that happened to me, with an '81 240, it was a frayed spot on the insulation on a wire that swayed just enough under acceleration to ground out on the block. It was the very devil itself to find. Might be less time-consuming to wash everything down and just go ahead and tape all the potential friction/abrasion spots until you can get your new harness installed. Good luck. By the way, a heat lamp in a big reflector clamped to the hood is great for keeping your fingers unfrozen in crummy weather.
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