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Only fuse you need is the power wire leading to your aftermarket amplifier for te subwoofer. Which most likely you have too small of a gauge of wire and burned straight through it, and if you haven't, add a 40 amp fuse near the battery where your power cable is hooked up to. Also use a multimeter to test your power wire on amp, check the
If you are getting power the amp lights will be on k so I would check your coax cables and all hook ups to the amp. on some radios there is a sub control that will turn on your sub and to adjust your bass mine does the same thing when i disconnect power to the radio.
First make sure you have the right wire hooked up, there is a Power Antenna wire, and remote turn on wire, and both are blue, but one has a white stripe.. Just make sure the right one is hooked up.
Now if the right wire is hooked up, and still no voltage there are 2 ways to get turn on power to the amp.
Option 1. Buy a LVT (low voltage trip), they come with instructions, and arent very hard to use. They will only turn on the amp when signal is sensed through the speaker leads.
Option 2. (I don't care for this one) Find an accessory fuse in the fuse box (meaning only has voltage when the key is in the on position), and run a wire from there directly to the amp. WARNING ABOUT OPTION 2. This can be noisy, and cause a whine in your speakers, this should be a last option.
This is your receiver going into speaker protection mode. this could be one of a couple of things based on what you have stated. The obvious would be that your amp is pushing too much power for your speakers. You can try a couple of things. 1st is check your watts for your amp and speakers and adjust your gain accordingly(may need to adjust how much your putting out). If it is turning off with the gain turned all the way down, then that's not the problem. Try disconnecting the RCA cables, then hook up to the battery and see if your amp comes on. If it does, you have everything hooked up right for the most part. Doing this will make sure your getting power to your amp.
If you get power with the RCA jacks unplugged, you might make sure that whatever speakers are hooked up to the amp are disconnected from the factory wiring. Those are some things to check based on what you wrote.. Could you be a little more specific with things like what kind of speakers and deck you have, how many speakers you are running, describe what happens when everything cuts off, etc.
make sure that you have the fuse in for the 12 pos if you do then the only other way to check it to make sure the amp works is put a jumper wire from the positive to the remote on the amp and it should come on if it does the you need to find a fuse in the fuse block and hook it up to it so that the fuse turns it on with the key just make sure you use a multimeter and make sure the fuse turns on and off with the key
A couple of things you can try: 1. check for B+12 on the 1st and 2nd terminals of the Power Connector using a voltmeter; 2. temporarily put a jumper on the 1st & 2nd terminal of the Power Connector; 3. the usual, check for loose connection, fuses, wires, connectors.
if there is +12 on both terminal and amp is still dead, then it is internal; if there is +12 on terminal 2 but none on 1, then it is the wiring from the head unit or the trigger of the head unit that is the issue;
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.