I turn on my car and the amp goes to "protect" which is red instead of "power" which is green and turns it on. I've checked the ground wire and its functional and working. The power cable is connected and has all new fuses as does the amp. So i can't figure out why the amp won't power on. If you could help me i would greatly appreciate it!
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Re: Can't get the amp power on
Hi, by design the protect mode is activated if it senses a fault in the system which can either be:
speaker problem - check the speakers connected to the amp. also check that the speaker wires are not (scraped) rubbing to the car body. On the speakers themselves, using a continuity tester (better with a VOM) should indicate anywhere from 4 to 8 ohms on the terminals. In the absence of a continuity tester, a single AA battery will do to check if the cone/coil will move if the AA battery power is applied to the speaker terminal (this is not a sound practice but in the absence of a tester only). If the reading is either 0 ohms or infinity (no reading) or no movement (if using the battery method), then the speaker(s) need replacement.
Amplifier problem - this is identical to the problem and possible solution at http://www.fixya.com/support/t162539-amp
Good luck and hope this be of some help. Pls post again how things turn up.
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Disconnect all the wires except the three main power wires, ground, 12v battery and remote. Now, turn on your radio, if the protect light is still on then there's an internal short in the amp. If the light turns green, then there's a short in either the auxiliary cables or the speaker outs. If it turns green, then troubleshoot the other wires that plug into the amp by connecting them one at a time until the protect light comes on, which will tell you that there's a problem with that speaker/aux wire.
Thankyou for the detailed fault description..it really helps!
sounds like there is one of these 3 things wrong:
1. leaky or partially blown mosfets on ouput power stage of amplifier are leaking DC onto speaker output causing amp to go into protect..this explains any banging or clicking herd.
2. There has been damage to the internal SMPS and is going into protect because of an internal rail over-voltage/under-voltage.
or 3. you have a shorted speaker lead or sub that is bringing the amplifiers load down to less than 2 ohms..buy or obtain a multimeter and have a poke around and check all your speaker leads on the ohm setting anything lower than 1.6 ohms and you have a short...also make sure that you have correctly loaded amplifier to..alot of begginer audio enthusiats overlook this important step and cook amplifiers!!
remeber impendance ratings, have a look on google, search "impendance formulas" and study up if your unsure!
check the impedance load or try a different ground. when you hook your ground up always make sure you sand the metal down before you connect to ensure a good and clean connection.as for the impedance, make sure your subs are wired to the right ohms. for example, if your subs are wired to 2 ohms or even 1ohm, and your amp is only 4 ohms, then it will do exactly what your saying it does.
Unless the amp itself is defective, there's a short or ground somewhere.
First disconnect the speaker wires and RCA (or high level) inputs, leaving just ground, remote turn-on and power leads connected. Then see if the amp powers up normally. If it doesn't check the ground with a multimeter and make sure it is good. If the amp powers up normally, check the speaker, speaker wires and inputs for shorts or grounds.
The protection circuit can be activated by shorted or grounded wiring or it can be caused by a defect in the amp itself.
First, disconnect all wires except power, ground and the remote turn-on lead and see if the amp powers up normally. If it still goes into protection, the amp is defective, most likely shorted outputs and needs repair or replacement. If the amp powers up normally, test the other wiring for shorts and grounds. You can reconnect them one at a time to determine which one is causing the problem.
Does it have a antenna connector to turn it on. this sometimes is a blue wire that comes from the radio. This normally turns the amp on when the radio is turned on. you should have a power (red) ground (green or black) and a power control wire they are right next to each other on the amp
Disconnect all speakers, then turn the amp on. If there is no internal problem with the amp, it will go green. If it does go green, reconnect your speakers one at a time with the amp off then turn it on. when you connect the speaker that's causing the problem, the amp will go into protection. At this point, it's one of two things, a bad speaker wire (screw thru it or touching another terminal) or a bad speaker(burnt voice coil) to test that wire, disconnect the wire at the speaker and turn on the amp, if it's still green, all's well in the wire department. Meter the speaker with a multimeter on resistance, if it's blown the meter will read 1.... If you don't have a meter, connect the speaker that's having the problem to the other channel and test again, if it goes into protection, you've got your answer. Bad speaker. Hope this helps