I have a 94 GMC Sierra K1500 and all my gauges are goin crazy, they all bounce when i turn on my lights, turn on my turn signals, step on the brakes and the bounce to the beat of my stereo and they are not reading accurate i have checked all my wiring and fuses and could not find the problem, am i over looking something??????? HELP ME PLEASE!!!!!!!!!

Hello Rehayes83569,

Just off-hand, since you contend that
your sound system has a profound effect...

I would skip past the BATTERY... (+ voltage regulator)
and move quickly to your GROUNDING system...to VERIFY
good clean connections throughout...

More importantly... if you have any recent
MECHANICAL or BODY-WORK...

Very IMPORTANT ground straps are accidentally
left disconnected...

Typically
your PRIMARY GROUND is to the engine block
and BODY grounds (your trouble area) are strapped
to various body elements from there...
A detailed DIAGRAM on Technical Service Bulletins
(TSBs) are available FREE on BBB Industries WEB
at BBB Industries Premium Alternators Starters Power Steering Products

Registration is required (as these are real documents.

Jumper CABLE:
A simple test from major BODY BOLTS in your dash area
to your GROUND post directly on the VEHICLE BATTERY
ought to prove/disprove my theory.

Hope this helps.

Carnac the Magnificent