Speakercraft BB1265 schematic of ground circuit

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the definition of schematic

http://www.minecraft-schematics.com/

Thats a tough one. They no longer have the part and they are custom made for that product. best bet is to find a junk one w good transformer to use

check on Parts Express.com. they have great customer service and replacement parts.

The wiring diagrams for your 2003 GMC Sierra power window circuits are copyrighted material and cannot be posted here. However, I can describe the driver's power window circuit to you.

Battery voltage is provided to the driver's window (master) switch via the ORANGE wire at PIn #2 on the switch connector which comes from the 25 Amp Left Window Circuit breaker located in the fuse block on the left side of the dash.

There is a logic module located inside of the master switch which controls the "Auto Down" feature for the driver's window. When the switch is operated in either the "UP" or "DOWN" position, power and ground is supplied to the window lift motor via the BROWN wire (Pin #1, Connector 2) and the DARK BLUE wire (Pin #3, Connector 2) Thease wires will switch polarity dependin on whether the switch is commanding UP or DOWN.

The schematics show that the ground circuit for the driver's window motor is supplied internally by the driver's window switch module. It is most likely grounded inside the door panel itself - the schematics do not specify. To check for ground, you can test continuity to ground on BOTH the BROWN and the BLUE wires by back-probing them with the switch electrical connector plugged in and the window control switch in the NEUTRAL position. They should both have ground.

When the switch is operated, one will remain ground while the other switches to power.

unplug all speakers and see if that works

Sounds like its a problem with over heating. open unit clean out all dust and dust bunnies wich compressed air. check that all fans are opperating. (fans on 6x100 amp units or thermal controled). If amp goes into protection prior to fans turning, there is your answer. the @ power supplies will have a green light on the output side. if the light in on power supply is good. or you can check that the output voltage is at 48Vdc on both units.

just find a good amp repairman he can fix it for you.google one.

Can you post the markings on the existing transistors? Also, if these are the output transistors, there shouldbe a complimentary one located close by Q24+Q34 maybe? Post those markings too.

Thanks,
Dan

start by connecting speaker like the book-then you make setup for all your speaker and confirm that all in on status-check your cable for bad cable(short circuit-or open circuit)-you can insert the speaker one by one if you are in doubt that something wrong.