Thread: '51 Chevy taillight wiring

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You really can't tell without a schematic of the turn signal switch internals, seems to me. However, on your schematic you have a "natural" color wire going from "connector on stop lamp switch wire" to the lower connection on the turn signal switch, which would seem to be a +6V when you actuate the brake switch, and that lower connection has "existing jumper" to the top connection on the turn signal switch. Logic would say that this powers both "legs" of the turn signal switch when braking. What I don't understand from your schematic is that it only shows one wire to each of the rear lamps, "natural with black & green cross tracer". You need two wires to each for separate tail light and stop light filaments. It appears to me that this schematic only shows your parking & tail light circuits, and that there must have been a second schematic for your rear stop/turn circuits.

If you compare your wires on the turn signal switch to the schematic you've shown do they match, or do you have two wires to the rear that are not shown on the schematic? You either need a helper to press the brake and energize that circuit so you can check for voltage at the turn signal switch, or a right sized stick to wedge between the seat back & the brake pedal to keep it pressed down tight enough to set your pressure switch. As an alternate you could jumper from your battery + to the switched lead on the pressure switch, and continue to work alone (often my approach).