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On my 67 B model that is the QB1 wire. It comes from a 2 amp breaker. Without the oil dilution system the wire capped off. I believe that breaker also powers some instruments.
Is there anything that doesn't work in the panel?
Do you actually have the oil dilution switch/valve?
This is an easy circuit to trace. The bundle from the circuit breaker panel goes forward and turns around the edge of the lower panel. It joins up with the bundle coming to/from the front engine. The bundle is right behind the lower switch panel. I would start by identifying/tracing the QB1 wire. I don't recall what other wires are hooked to the load side of that breaker. I think it's the engine gauges. It's worth looking close at that area. I've included a pic of the back of my engine inst. panel that I just finished cleaning up the wiring. The spade terminals can get loose and cause problems.
A methodical approach will identify the problem. I'm not excited about just throwing parts at problems like this.
Dave
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