Headlight Switch Schematic

Davidrad said

Sorry to tack onto an old thread. I've gone through a few headlight switches after getting this 70 Dart ok the road. There must be a root cause I don't see the spade terminal that sticks out the back on the diagrams. Is it a ground for the switch? And if so that may be why i lose my lights.

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That spade terminal for a ground wire wasn't present on early OEM switches. They mounted in metal and got the ground there. It is found on all newer switches so one size/type fits all. Adding a ground wire here can't do any harm but... there isn't much benefit either. Improved chassis ground for instrument panel in general. Only part of lighting circuits grounded at this switch is the dome lamp. all other current paths are in on one terminal and out on another. Ground happens beyond the bulbs.