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Sounds to me like the amp is going into protection mode. Try placing one sub on the amp with very little gain. One of the biggest reason why this happens is because the subwoofers are wired wrong. What is the brand and model number for your amp?
Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.
your drawing/pulling too many amps. Is it a mono(one speaker), two way(two speakers/can be briged to one), or a four way(four speakers/can be brigrd to two). don't put too many speaker to that one amp if it's only a mono, or a two way.
this is usually a problem with incorrect cabling you should check and see that all your cables are connected properly especially the ground cable thats what would normally give you a red light on your amp
never ask geeksquad about amps lol check your ground wire connection and push on sub do you feel scratching if so its blown sub also never turn an amp up all the way it starts pushin dc voltage witch a 200 watt amp can blow a 800 watt sub dc voltage is not good for subs also up all the way can burn out the internal battery in the amp lets hope thats not it just make sure ground is good protection light means that the amp has power but a connection is not bien made sum where to complete the circut
Start removing wires from the amp, one by one (except for the +12V, Ground, and remote) until the amp seems to work fine. Usually, this type of issue is due to a speaker wire shorting to something it shouldn't be touching. Check the "non-amp" end of all the wiring to make sure they are solid and correct.
you need a # 4 gauge wire.
check the subs conection no less than 1 ohm.
and if the cap is good.
13.8 volts are for max ouput ......this is 1 ohm of charge at 13.8 volts they give 2500 watts butt only at 13.8 volts whit this relation.
i¨n think you need other alternator.
Almost all after market amps use 12v at very very low amperage to trigger the amp on. A temporary jumper from the battery plus terminal on the amp AFTER the battery and ground wires are attached should cause the amp to turn on. I would check to see if you have attached your speaker load correctly ESPECIALLY if you are bridging. Most of the blown amps that come into my shop are due to incorrect bridging loads from the speakers. Note that a 4ohm load bridged across both outputs of an amp will deliver a 2ohm load to each of the channels. When you parallel wire two 4ohm speakers together and then attached them to a bridged amp you will be putting a 1 (one) ohm load to each channel of the amp. Please don't make this mistake. It will fry your amp in about a month. Hope this helps. Good luck.