Rally Dash

the plug has one ground of the board plug
This cluster board connector has NO ground wire.

This is the diagram from the 71 service manual, I can find no such diagram in my 70 manual. YOU MAY be misreading the legend at far left, where it says G1-18BK FEED and then GROUND below it.

Bear in mind that BLACK wires are NOT necessarily ground and in fact there are actually FEW ground wires in any of these cars Many of the lamps, the VR, alternator, and so on, are grounded directly and not through wiring.

71Rallye.jpg