All of the dash lights and the clock/radio lights go completely off when we get to around 15 mph. The headlights stay on without a problem. The dash lights stay off until we slow down, then they come back on. But a soon as we speed up again, out they go. Thanks for your help!
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there is a regulator for the display brightness, you may have it turn'd down or it has stopped working;. it controls the brightness at which the dash lights are. usually has a speedo sign on it. goes up and down. it works with the main light and is conecter to them on the same lighting board if it has gone then a new light swtch control switch will be needed.
From your description this looks like overcharging. Check your charging system for overcharging and the wiring. A loose connection to the regulator can cause a surge in charge voltage and let out a very high voltage.
1990 Jeep Wrangler. Driving with lights on for 10 - 15 minutes. First the dash lights go out followed by the headlight and tail lights. If you pull the dimmer switch back (like you would to flash your brights at someone) the head lights will come on and as long as you continue to pull back on the dimmer switch the head lights will stay on bright.