Whats the easiest way to check and see if a car stereo works. I have one laying around and i want to see if it will power up. Whats the easiest way of doing this without wiring it up to my actually car through the stereo wires?

 

connect the yellow and red to a +12v power supply
and the black wire to the -12v supply

the deck should power up and work

for a sound test you will need a speaker and just connect it to each set of outputs and listen

hope this helps