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Glad you got it fixed and I could help. The loose fuse is a common issue.

Thanks for the update. Please let us know the outcome.

I changed the thread title so others with headlight issues can find it. From your description so far it sounds like you have power through the Blackout switch and the headlight switch. Next I would disconnect the plug from the dimmer switch and see if you have power there. The switch is...

You need the TM 9-2320-289-20 manual. It covers more of the basic/electrical troubleshooting. Your TM 9-2320-289-34 is more for the major components. We have all the manuals for free here. Your headlight problem is a specific issue and it is "okay" to ask about it. The problem comes when...

Straight from the troubleshooting section of the TM 9-2320-289-20 tech manual: 33. HEADLIGHTS INOPERATIVE IN HIGH AND LOW BEAM (ALL OTHER LIGHTS OPERATE) NOTE It may be necessary to remove headlights to perform this step. Step 1. Check for voltage at headlight connectors. If there is voltage...

The stock headlight wiring supplies power to the headlight upgrade harness. It supplies 12v to the new relays that feed the headlights. You switch on the stock headlight controls and instead of supplying a bunch of power to the bulbs, it supplies a little power to the relays. Before you think...

Welcome to the site. The horn on issue can have an effect on the headlights. Do some troubleshooting and report back. Could be as easy as bad headlight bulbs.