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First check to see if your'e getting power to the amp by using a test light and touch the main power(12V battery) connector on the amp, test light should come on since it's constant 12v supply. Now turn on the radio and test the remote wire connector on the amp and you should have 12V(test light should come on). Also make sure that you have a good connection with your ground wire, check both connection points to make sure it's good. Now if you have power where your'e suppose to and when your'e suppose to and the amp does not power up, then it may be time for a new amp. Try wiggling the connections at the amp a bit, the solder may be cold/loose.
I will assume that it used to and has a remote wire connected. if this is the case the only things I can think of would be the remote wire is disconnected/loose/damaged. if that isn't it I would look at your ground wires (all of them at both ends) if nothing I have mention pans out then I would simply add a heavy duty switch. :)
it depends, sometimes if your speaker is wired, if you have two dual 2 ohm subs and wire them in series ( +to+ -to- ) then they will wire down to .5 ohms, in which your amp is not stable other possible problems may occur if you wire these amps together to power one or two subs
Does the amp turn off when you remove the remote wire? If it does, then wire a toggle switch into the remote wire and just use it to turn the amp on and off. If the amp does not turn off with the remote wire removed, there is probably a short between the 12V+ and remote terminals. In that case, the amp is probably defective. If it is OK otherwise, you could still use it by putting a heavy duty toggle switch into the power wire itself.
check your wiring make sure it is not grounding out check you sreaker wiring make sure they are not reversed +to- make sure it has plenty of air ti breath make sure your speakers are wired for two ohms or four it is not stable for one ohm it has a circuit protection if any one of these thins are happening it will kick the red light on and shut down.