1985 Jeep CJ7 Headlights

Electrical problem
1985 Jeep CJ7 V8 Four Wheel Drive Manual
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Guys,
I have a 1985 CJ7 that i restored
I installed new Halogen headlights
everything is new, Wiring Harness, etc.
The problem is that about 10 to 15 minutes after
i turn the headlights on, they begin to Flicker
then eventually go out
I have a new Battery, etc.
What is the problem
Thanks,
Ted