Depends what wireing kit you are useing.if you are useing say a 300watt kit then the fuse in the main power lead is normally a 25amp fuse,and this should be installed a maximum of 12 to 18 inches from the batery. hope this helps.
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what wattage are the subs and amp? if your subs are more wattage than your amp, your amp will blow fuses as cant handle the output to your subs. for example. you have 2 500 watt subs and a 300 watt amp, that is no good as amp isnt powerful enough. if you have 2 500 watt subs you need at least a 1200 watt amp to power them both. 200 watt more than the combined wattage of subs as amps should never be turned up to max as they tend to blow and overheat more quickly. 80% volume on amps is reccomended by installers and manufactures.
Your best bet will be to wire 2 subs in parallel to the amp. Each sub should be rated for at least 300 watts rms at 4 ohms. This will give you a total impedance of 2 ohms, and your amp will put out 600 watts rms at that impedance. That way, each sub will receive 300 wats rms. I would not recommend wiring subs in parallel, as you will need two 1 ohm subs at 300 watts rms, which are harder to find and will be more expensive. A parallel circuit is the most efficient way to do it.
A mono amp usually can handle only two 4 ohm subs. You see when you hook up two subs in parallel it drops the ohms too 2 ohms and 3 in parellal drops it to 1 ohms overheating the amp and cause power failure. Unless you bought a Mono amp thats 1ohm stable. But still I've seen cheap 1 ohm stable amps not last long. Also possible your subs are fried too check them with a multimeter and measure each sub ohms.
It's not bad, but at 400 watts, it's a bit underpowered It'll be plenty loud, but the amp will distort before the speakers do, particularly if your subs are wired in parallel (as dual-driver boxes are typically wired)
Listen for distortion, and turn it down a bit if the sound gets fuzzy or static-y sounding
If the 1,000 watts is RMS, I'd recommend an amp in the 750-1,000 watt RMS range, perhaps like the Alpine MRP-M1000 or Rockford-Fosgate T1000bd. If the 1,000 watts is peak power, the subs continuous (RMS) power handling is much lower, probably 300-400 watts. In that case, I'd recommend the Alpine MRP-M500 or Rockford-Fosgate T500-1bd.
I believe these are 4ohms, if so buy a 2ohm stable monoblock amp, that puts out 250-300 watts RMS, and connect your subs to it in parallel, don't pay attention to peak watts, look at RMS watts, or continuous watts. If they're 2 ohms, buy a 2 ohm stable 2 channel amp that puts out 125-150 watts RMS per channel, and 250-300 watts total or bridged RMS output. And connect them normally, on sub per channel... hope this helps, as far as brand recommendations, MTX, pioneer, Alpine, Kenwood... Good luck
Unfortunately some of these speakers today... DO NOT PERFORM up to peak as they should.The on logical reason for this to be happening it that the speakers are NOT very DURABLE and cannot take constant playing. I would recommend to L7 the can take alot more abuse than your average speakers. Good luck and thanks for using FIX YA