On my 1988 wrangler, the headlights and taillights went out .Brake lights will not work also. The gauges still light up and the turn signal and high beam indicator stay on. I have check the switch , could it be in the multi function stalk ie turn signal lever? The lights will work fine one day and not the next. i have reeplaced all the fuses .
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Make sure all bulbs are working. All blinkers, tail lights, brake lights etc. I know you mentioned most of these lights work, however it only takes one light to throw off several others. Trace wiring from each as far as possible to locate a possible break in the wiring (shorts). Also, check the headlights and make sure they are plugged in all the way (even tho they work). Also check all relays. One dirty connection can cause all sorts of problems. Jeeps also are known for their poor wiring and common electrical issues.
It is a ground problem. When you turn on your headlights, they are sharing the same ground that your brake and T/S lights are using. Check all ground connections to the body from all headlight and taillight wiring are connected and tight. If it doesn't affect your taillights, it may be in your T/S switch. Check your ground connections first.
You checked to make sure you didn't blow all the bulbs at once? If your front park lights work, then the headlight switch is probably alright. You may have a taillight relay in your fusebox. Check the owner's manual. It may show it.
the whole dash's wiring comes through the headlight switch, this switch contains a rheostat (an adjustable dimmer for the dash lights), which are notorious for going bad due to their static type operation, chances are it needs a new switch.