Where is the speaker relay located for a 2006 silverado 2500 hd

SOURCE: Coolant Temperature Sensor location on 2006 impala

driver side of the engine block, forward and above the transmission. This piece threads into the engine block.

SOURCE: Where is the location of the knock sensor for a 2005 HD 2500 6.0

HAS TWO KNOCK SENSORS they are both under intake in valley of engine. remove intake and will see two black grommets they are under those best to replace both at same time

SOURCE: 2000 ABS relay location

Unfortunately the ABS relay is built into the EBCM. Electronic Brake Control Module. That is located on the frame rail, left side of vehicle and sits on top of the pump. Both parts are likely to be replaced together as getting the module off the pump can be difficult. I recommend a repair facility do this job but it can be done at home. You will likely need to take loose metal brake lines and that can be quite a task also.
Are you getting a code for the relay / EBCM?

Good luck
Please rate my answers if they helped.
Brett

SOURCE: blower motor on my 2003 silverado 2500 only works at high speed I was told it may be the resister If this is true where can I find the resister on my truck THANKS

Chanses are its the resister, it should be located by the heater motor, most are above heater box behind glove box.

SOURCE: 2006 Chevrolet Silverado 2500HD tail lights stopped working

I am having the same problem on an 04 2500hd there isa 15 amp stop light fuse inside the cab on the side of the instrument panel and a 25 amp stop light fuse under hood. you could also have a break switch issue the switch is located up on the break pedal linkage you should have power on the white wire when you push the pedal in (check with a test light) in my case I have a broken wire along the frame rail in the harness it is a light blue wire,