I was driving yesterday and the amp overheated, so i disconnected it and pulled it out of the trunk to let it cool overnight. I went to hook it up again this morning, and it only powers on for about half a second when the stereo is turned on and then the light comes on again. I pulled off the back cover and it didn't seem as though anything was fried internally, checked the wiring from the battery, checked all the fuses, just about everything i can think of and nothing. What is wrong????
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the radiator temperature is broken or cable to it is disconnected ?
if true they are set to run constant the fans to protect the engine from overheating. also check the relay is still seated correctly.
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.
Red light is on if:
- thermal protection, overheated amp, bad thermo sensor
- DC at speaker terminals
- high current at output transistors
Also could be a protection circuit malfunction.
In any case you need new channel module or send your module or whole amp for repair here.
The most likely causes are overheating and operating the amp into too low of an impedance. Or the amp itself could be failing. If the protect comes on immediately after the amp has cooled overnight, it's probably not overheating. Too low of an impedance can be caused by a shorted voice coil.
You can check the load with a multimeter. Disconnect the speaker wires and measure their resistance with a multimeter. Since the published impedance is nominal and varies with frequency, you'll be reading the DC resistance. Some manufacturers include the figure in their "R subscript e" specification. Usually, it's a little lower than the impedance. So a 4 ohm load may read 3.2 ohms. If the DC resistance checks OK, it's probably the amp itself.
if your amp is overheating your sub is needing to much power that the amp doesnt have.
if its cutting out and the red light comes on you need to check the wiring. nothing not even the tinyest speaker wires can be touching.
proper wiring would be your best bet.
but i would upgrade amps.
cheap bang isnt reliable.
The thermal protection would have reset when the amp cooled down. When cool, if it still goes into protection when it powers up, there are likely blown output transistors. To be sure it's not a wiring problem, disconnect the speaker wires 'from the terminal block of the amp' and disconnect the RCA cables from it. If it still goes into protection, the output transistors are almost certainly shorted.