It might look silly, but normally the explanation why an amp is not functioning is due to the fact the obtain level is not turned on. If the get level is not on, no sound from the speakers will be created. When accomplished, reconnect the negative cable of the car and hook a single of the speakers up to an amplifier to check its perform. The final point, for install the car audio systems using this way, you also really should discover how to save funds, and you should really stick to the instructions. The only thing is that in soon after marketplace obtain you can take the model of your choice, which is not achievable in car model.