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I agree that checking the ground is probably the best place to start. I had a problem many years ago with my '88 Escort where neither of the headlights were coming on. Got to checking under the hood and traced the ground wire back to where it grounded to the frame and the screw was loose, tightened it up and all has been well ever since. If it's not a grounding problem, since the high beam indicator doesn't illuminate I'd suspect the possibility of a switch with a short in it or a bare wire that's grounding out somewhere on metal zapping all the juice going to that light. I know in theory if there's a live wire grounding out it should blow a fuse, but it doesn't always happen that way.
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