MTX TECHNICAL SUPPORT 1.800.225.5689 1. No power: Verify that the Ground, +BATT, and remote cables are securely attached to the amp, the connection at the + terminal of the battery is secure, the remote turn-on is securely fastened to the source unit and that the in-line fuse at the battery is good as well as the fuse on the amp. If fuses are blown, replace them and attempt to power the amp back on. If fuses continue to blow, please see an authorized dealer. To con? rm that the amp is getting power at the +BATT and remote, use a digital multi-meter set to DC voltage, attach the negative terminal of the meter to the ground and the positive to the +BATT and then check the remote. The remote and the +BATT should have 11-15 volts. If the amp has a good ground, +BATT, and remote voltage and will not power on, please visit an authorized dealer or call the technical support number listed below for further assistance. 2. Power light on, no output: Turn the audio system off (source unit and ampli? er), check output signal connections from the source unit and input signal connections at the amp. Remove speaker wires and test for open connections or shorts with a digital multi-meter set to the impedance setting. Reconnect the speaker wires and test the system. If there is still no output, visit an authorized dealer or call the technical support number listed below for further assistance. 3. Amp turns on and shuts off: Turn the audio system off (source unit and ampli? er). Remove the speaker wires and test for open connections or shorts with a digital multi-meter set to the impedance setting. With your ear close to the speaker, gently push on it. If it sounds scratchy then replace the speaker or consult a local dealer. Carefully touch the amp...