Re: Which AC Delco Headdlight Switch?
Good suggestions given. The rheostat for the dash lights and interior does, over time, develop what is commonly called 'burn spot' and switch contacts develop carbon spots on the contacts themselves and these deposits create resistance and some power, read current, is given off as heat, so less power to the bulb.
One event one can do is twist the bejesus of lamp switch to 'clean up' the wiper arm-to-wound coil' contact area.
The contacts within switch, not much you can do, except if you're real industrious, take switch and place in 9X12 cake pan, unroll the crimps on the switch body, and wa-la! the switch contacts are in sight and they can be cleaned with emery paper. and reassemble switch. The cake pan is for catching those small parts falling out.
My suggestion is, when you replace switch, it is grounded to the dash by surface contact. Sand the backside of dash with emery paper, clean area, and smear/moisten the same area with grease/oil for rust prevention, then install switch.
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