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Running lights, marker lights, and dash lights all come from the park light switch of the head light switch. So, possibly you need a new headlight switch. Or, if you have a voltmeter, you can do some testing of circuits to see where power is and where lost. Also check the fuse for tail lights and horn.
The fuse for the horn can not make it blow.only a bad horn switch/button can do that.The tail light fuse should be marked in the fuse panel.If you have the vehicle manual you can most likely find it in there.
Sounds like a short like the insulation on wire rubbed off. Could also be a loose connection on either the hot or ground side of light circuit. This would blow a fuse.
me id start by looking real close at the wires to and from the head and tail lamps and handle switches , then id go farther at looking inside the head and tail lamp housings for say water or a rusty or damaged wire , finnaly arriving at looking at the battery voltage with a voltmeter when im reving engine this shouldn't go over say 12.8 volts if it does your voltage regulator is defective and is damaging all your bulbs
check the parking light fuse or taillight fuse to make sure it has not blown. replace it if it has blown and see if the lights work or if the fuse blows again. if it blows when you turn the lights on then you have a short circuit that needs repaired. if the fuses are good ,then most likely the headlight switch is bad not allowing the taillights or dash lights to work.
Sounds like you have some confusion going on here.
The dash lights and tail lights have always been on different circuits and fuses. So if one set of lights fail, the other stays on unless the headlight switch blows up.
The fuse marked "instruments" is for the speedo and gas gauge, not the lights.
On your car there is an instrument panel module and a dash integraded module which both involve the dash lights.
You may need a shop manual to get the wiring diagrams and test procedures for this circuit.
Another thing - after 1998 most cars and trucks switched from having the headlight switch provide power to having them provide the ground connection.
If the tail lights and the dash lights stopped working and the tail light and the panel lighting fuses are both o.k. and you can find no other blown fuses then the problem is most likely the headlight switch.
No interior dash lights and no tail lights on a GM usually means it's time for a new headlight switch. To check the fuse, it's in the middle of the fuse box marked instrument cluster. If the fuse is good, buy the switch. Lights blowing fuses means you either have a bare wire running down the driver's side of the truck or up into the tail light assemblies. There is also a plug in under the box on the driver's side near the bumper that may be getting wet. Hope this helps.
It sounds like you solved this one your self . It does sound like the switch has went bad, but also look for any lose or bad wires around the tail lights and the wire harness going to them.
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