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Wild Turkey, awesome logical breakdown—thanks so much for taking the time to do this!

To answer the question above, I pulled the headlight low beam relay.
Key out: Side markers work, high beams work, but low beams don’t. However, when I switch the low beams on, pin #2 goes to ground (tested with a test light).
Key ON (relay still removed): All headlights turned off, and pin #2 returns to ground as soon as the key goes to on.

Based on this, I believe this confirms that pin #2 is the grounding control point for the relay.

Do you agree?

Starting on the rest of your post now

[QUOTE="Madhatter10-6, post: 2092140, member: 25899"] Wild Turkey, awesome logical breakdown—thanks so much for taking the time to do this! To answer the question above, I[U] pulled the headlight low beam relay[/U]. [LIST] [*][B]Key out:[/B] Side markers work, high beams work, but low beams don’t. However, when I switch the low beams on, pin #2 goes to ground (tested with a test light). [*][B]Key ON (relay still removed):[/B] All headlights turned off, and pin #2 returns to ground as soon as the key goes to on. [/LIST] Based on this, I believe this confirms that pin #2 is the grounding control point for the relay. Do you agree? Starting on the rest of your post now [/QUOTE]

Verification