Re: Dim Headlights on 40:
I'm mostly repeating what has already been posted, but I would make up some good jumper wires and start doing some checking. See what you get with each.
Jumper across the light switch from the hot wire to the wire going to the dimmer switch.
If that isn't the issue, try a jumper around the dimmer switch.
Next, try a jumper from the headlight ground stright back to the battery.
Etc, until you find the problem(s).
Grounds can always be a major issue, but the lighting switch reading seems suspect.
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