If you read my entry "Puzzling Electrical Problem" you will get up to speed.
What I need assistant, advice with is how do I jump the headlights to see if my high beams work.
I have tested the entire cab for continuity ( everything tested good) I have replaced the dimmer switch and the headlight switch 2 times( going for a third time since it does not light up the courtesy light).The blue and light green wire in the dimmer connection test with power.
What can I test next?