so my windows wont work when my lights are on.my left trn signal light stays on when the lights are on.my rear antilock comes on and off bt shts off if i psh on the light switch.my ebrake light flickers if i dont psh on the light switch.all my gages dont work except my spedometer and my lights that light p the dash are gone from 45mph to 85mph bt flicker sometimes.so i need some help figuring ot what the hell is going on in my dash.oh and i can hear a crackling noise in my dash.

 

id say something has gone to ground,

 

so im gona have to trace every single wire

 

i would check the grounds first, not 100% where exactly to start, judging by your name if its the old body style 6.9 (early 80s) should be pretty basic as far as wiring goes

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could def try changing the light switch out too, there is alot happening inside that switch

 

yeah its an 87.i am buying a newlight switch and wiper switch and some of the wires got corroded