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My cluster light has no power when headlamp switch on , checked with test light . Also anothere poblem im running into is gauges are not working they are connected to LPS on fuse box , all connections power and ground are good. does anyone know where i can start to fix the issue >> thanks
 

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The tail light fuse feeds power to the headlight switch and is used only to feed power back down to the dash light fuse. GM's idea to let you know your tail lights are out. You should have power on the dash light fuse/grey wires behind the dash, only when the light switch is on. 1. Check that tail light fuse and make sure it is sending power to the switch. If it is and you still have no power on the instr lamp fuse check the switch itself.
 
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