SR is starter relay and the mod is a 8 gauge wire direct from the alternator to the BAT terminal on the SR and another piece from POS terminal on the battery to the BAT terminal on the SR.
Your reverse lights run from reverse light switch to D on the firewall connector out C on the fire wall connector then to position 4 on connector behind the drivers kick panel then to the backup lights. I would check at the firewall connector first. This is the routing for my 69 4 speed.
Well for those who followed my charging system journey know that's it's been a tough go. Well after many hours of wire fixing, new parts and more new parts, I finally got the road runner to pass the charging system electronic diagnostic test. All system pass but the test did indicate a VR low...
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