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I do not know-a quick check in one reference indicates wires do have a finite resistance-but measured in milliohms. If your meter won't zero with the probes together-buy a cheap analog with a thumbwheel-that is what I have been using lately. You can adjust it to zero.
Why don't you regroup, have a beer and finish off today by wire brush cleaning all fuses and ground posts, coating all cleaned surfaces with dielectric grease. Study the diagrams and trace power in from bat plus to switches to relays and fuses, and through to the lights. Take a look at a 74 current flow diagram-it helps to understand how stuff functions.
Then remove the light switch and map the terminal numbers and wire colors.
Next-measure volts at terminal 30, key off, and term 75 key on.
Then, using the diagram-chase down the voltage to parking, low and high beams, then do turn signals.
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