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Hello
I have a 68 and the chevy assembly manual- I am looking at the wiring diagram and the counsol ground goes to the grounging block and the 14B wiring goes to the heater lamp; also,: 20 gray continues from the heater lamp to the counsol lamp.
I'm having the same problem with my 68, There was a black wire laying on the floor under the console trim plate and a male Ground clip on the trim plate it self, so I made a jumper wire hooked it to the trim plate and the console light come, on but no heater light. Just thought you may have found where these wires go.
Chrisco.