Re: 67 Camaro Wiring Question
You should be getting min 13.8 volts, dependent upon alternator used.
If external regulated, voltage regulator may be the issue or alt may be bad. Measure BATT stud, red wire, s/b over 14 volts. Replace VR with a plug & play Wells VR P/N VR715 and don't forget the ground strap on reg chassis and mounting bolt.
You could also have some high resistance between horn relay buss bar and battery junction block, wire braush all components, follow the red wires.
If you have an internal reg'd alt, 10SI or 12SI, do away with ext reg'r and jumper the two inside wires and the two outside wires, and plug blue wire into #1 terminal and white wire into #2 terminal on the alternator.
You might check/clean battery cable clamps also.
If running an electronic distributor, you should run a new power wire, 12GA wire, fromt he ign spade on the fuse panel to IGN terminal on the dist and tie back the cloth covered wire as it is not used any more.
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