Hey guys I recently bought a 1996 blazer my buddy and I wired subwoofers and I put in led headlights and now my tail lights and dash cluster lights won't work fuses and bulbs are fine any help is appreciated

 

Check your fuses. I forgot which one it is but if the 1 fuse blows, all those lights go out.

 

Tail lights have a fuse and dash lights have a fuse. If you blow out the tail light fuse the dash lights also go out to alert you. Retrace your wiring to the subwoofers, shouldn't be wired to the taillights anyway. (Unless you want the tail light to flash with the thumping)

 

Many of the critical circuits are supplied by the same circuit for less critical items so that you will notice when they go out.

I had this happen when my OEM radio shorted out due to some nickels that had been put into it (by kids?) from before I bought the Blazer moved and kept shorting out the radio power supply which blew the fuse for it and my instrument cluster.