1991 GMC sierra making a high-pitched sound when the lights are on?

rollin out

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its the same warning sound saying you have left your keys in the ignition and/or left the lights on.
but the truck is started and running, and the sound comes only when the lights are turned on, but when turned off the warning sound stops. also the battery charge indicator is at "0" (Dead) but the battery is fine, starts fine and im not sure why its not working.
i was messing with the wiring added-on fog lights (disconnected). wjhat is it? fuse?
thanks
 
well unplug your warning thing for the doors i cant remember what its called but its under your dash on the firewall. and if its still does it is probably a your fuel pump may be putting an electical strain on it min makes that sound all the time
 


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