With the M46 manual shift, the Neutral Safety Switch (NSS) is by-passed with a jumper in the wiring. I think it's under the carpeting on the tunnel, but I don't know just where. It will be a small 2-pin "plug" with 3 wires on one side (two BL-Y and a BLK) connected to a Blue and a BL-Y coming from the shifter switch. Those two wires are replaced by a Blue jumper wire on M46 cars (maybe with removed M46 wiring/),
As for the Back-Up lights, there is a mechanical switch in the M46 top cover at the left rear. It needs two wires plugged into it, a BL-Y (12V) and a Black (leading to B-U lights). Again, I can't say where those two wires originate, but probably under the carpet near the Auto shifter switch, where a 2-pin plug presently connects 2 wires (Y and Blk) to the shifter switch.
Regarding the relay wiring, I now see that the original Red relay is the way to go. That means using it's original relay socket, with M46 wires removed and replaced by AW70 wires. I'll be back here, if I make it before the EDIT window closes, or make a new post with wiring details...
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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