"Brown" wire with ring connector that passes through rear tin grommet on driver's side rear of engine compartment. Is it a hot lead from the alternator to the starter which goes on the same post as the main wire from the battery positive? 1972 with a '75 1.8 L-Jet, no relay board, and a most terrible re-wiring job from new fuse box under dash. This wire looks to be original and splits off a larger bundle of wires that may go down to the alternator. Here's the pic.
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