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Hi There, This is Clay, I'm a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
From your description it's possible to have a defective headlamp switch. The headlamp/combination switch is the most common failure for no low beam operation. With the combination switch plugged in backprobe and ground the red/white wire at the combination switch and see if the low beams come on. If the low beams come on the switch is defective. If the low beams don't come on let me know and I'll send you the location of the red/white wire in the fuse box to check.
I hope this information is helpful. If you have any questions let me know. You can reply back to me through this thread at any time.
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I understand you have replaced the switch. What I saying is defective parts are always possible. I verify everything and assume nothing.
Was there any noticeable overheating at the headlamp switch connector?
That would be a good idea. I just read a service bulletin concerning melted connectors at the headlamp switch.
You can take a picture of and send it to me.
I'll be here all day tomorrow.
I don't know if you've grounded the red/white wire at the switch yet. Just so you know, you can also ground the red/white wire at either of the headlamps. As long as there is power going through fuse #17 in the underhood fuse box the low beams should come on. Verify with a test light or voltmeter there is power on both sides of fuses 15 and 17 in the underhood fuse box with the headlamp switch in the on position.
Let me know what all you find. Thanks