Re: decoding a wiring diagram
It can be either way. If you don't have an original harness to look at or can't find any pictures easily online that show what color wires go to which spot on the connector, it is a good idea to just ask here. Tell us what year truck you have. In case of the neutral safety switch, it is just a simple kill switch and doesn't matter which of the 2 wires are connected to which wire. The current flows either way through the switch.
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