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Have you checked for power and ground at the headlight sockets, witha test light?
yes therer is 12.5 voltsat the plug. but the low beam bulbs still will not light untill you ground the light ground to thre body .when you turn on the high beams ther is no voltage testing the bulbs to the battry both work fine high @ low beam
Are you using a test light or voltmeter?
You can have voltage, but it is not an indication of how well the circuit will carry current. I would use a testlight. Ground it, turn the headlight switch on, and look for a bright test light. Then, put the alligator clip end on power, and test the ground circuit.
In this case the ground is most likely the issue. Follow the wires, and I think you'll find the ground point is on the radiator support. Loosen the ground wire, give it a good wiggle to try and knock the corrosion off, and re-tighten.
If this info has been useful, please accept. Cheers, Todd