High-Beam Issue

[backwoodsboy]

Recently picked up a new rig (97 F250), and still trying to get a few quirks worked out.
Previous owner replaced the stock headlights with an HID unit. Overall, I like the lights. A lot brighter than other trucks of this era I've owned.
My issue is, when running high-beams for extended periods of time (something I do when cruising my local logging roads at night), the lights begin flickering on and off, and eventually stay off. If I switch back to low-beams, no issues. Lights stay on regardless.
I've checked the fuses, and everything seems healthy there. It seems to me that the previous owner may have installed bulbs that are too 'hot' for the wiring. While it hasn't been enough juice to blow a fuse, it seems like it heats up enough to short out. If I turn the high-beams off for a few minutes, they'll stay on for a while after. Road conditions don't seem to have any effect on it, so I doubt it's a loose wire. They'll do the same thing running down a smooth highway and bouncing down an access road.
Anyone with HID's running into this same problem? I'm at a bit of a loss.

[351fifty]

Your high beams are drawing more power than your harness can provide, they make a kit to draw directly from the battery instead of the switch its self. It's in my lmc catalog called heavy duty headlight harness part 47-3660 in the 80-96 catalog

[backwoodsboy]

Alright, i was pretty much correct with my assumption then.
For a quick fix could I change to a lower wattage bulb? Not sure if I'll have the time or money to get a new harness in the truck before I head back to school in January. Still have to do brakes and glow-plugs.
On a side note, do you know if any of those harnesses come wired for aux lights? I've got a deer-smasher on the front of my truck with some PIAA's that I've been meaning to re-wire.

[351fifty]

Not sure if harness supports that, but harness is cheaper than new bulbs, I always made aux lights on seperate power and switch