I have a 1600 watt amplifier wiring kit w/0.5f digital stiff cap and it has no instructions how can i get some?

Bridge at 4ohms your only getting 600watts rms. You will need to bridge at 1ohm (parallel) and adjust the gain accordingly. This will give it 1600 watts rms. If you would of had a dual 4ohm sub, then you could of bridged it at 2ohms mono, but you can't you have to go either 1 ohm or 4ohm. I believe it's not getting enough power.

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I'm having trouble visualizing exactly how you have it set up. You said that the amps are "grounded through the amp" but I think you meant they're grounded through the cap. I don't think that's the cause of your problem, but the cap and amplifiers really should be grounded separately. There's no reason to run the grounds to the cap instead of directly to the chassis. It seems more likely to me that the problem is related to your speaker wiring. I'm not clear on how your speakers are wired either; I can see that you've kept the speakers on factory wiring, and connected the amp to the factory wires. But I don't understand how that translates to having only one set of wires for both speaker sets. We'll leave the tweeters out of it; if they're wired through a crossover, then they don't have a serious effect on the impedance. However, any way you look at it, you've got two 4-ohm speakers wired together to a bridged amplifier. Most 2-channel amps aren't designed to be connected to load impedance under 4 ohms when they're in bridged mode. If your speakers are wired in parallel, then the load impedance at the amp is 2 ohms. Having too low a load impedance is the most common cause of amplifier overheating. My advice is to re-wire the speakers so that one 5x7 and one tweeter (together with a crossover) is connected to each amplifier channel. Don't run the amp in bridged mode. Even in this configuration, I'd be amazed if your 5x7" speakers are really rated to handle 310 watts RMS, which is the per-channel power rating of your amp in 2-channel, 4-ohm mode. It sounds to me like you've got too big of an amp for the job.

Protection circuit.
Checek the wiring of the amp and speakers, don' forget to look for shorts at the speakers. Make sure no wires are touching each other

Depends on the wattage of the amp, if the amp is 150 watts then yes use a 150 watt amp kit, but i'd go with a 30 amp fuse. Basically just buy an amp kit rated at the wattage of the amp, my preferred brand is street wire, but if you're on a budget buy Scosche. Good Luck, if you have any more questions please ask...

check the rca's for a short

ok here is how it goes power wire from the battery all the way to amp..then ground wire from amp to a good ground on car then the remote wire which you have to run from the amp to the back of your stereo which in most cases is blue then hook subs from the sub box to the amp

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You will need a 6 Gauge wiring kit with a 50amp fuse to the battery. You can verify this by looking at the kits being sold on the internet for 600 Watt car amps.

when in doubt go bigger, you might want to get a bigger amp down the road, so its better to not have to buy another wiring kit later.
and the bigger the wire the less line loss you will have so your amp will sound and perform better.

for $85 i can sell you an Almani 900 watt 2 channel amp i would stay way away from those 3 brands they are all really poor quality and i can get you any major name brand cheaper.
I can get you a hifonics 4008 amp (800 watts peak 100 watts per channel rms) for $100 shipped with full factory warranty. you find an amp you like and i will get you a price. I am a factory wholesale distributor for most brands.

the wire from your battery is blowing fuses? and you are using 20-30 A fuses? mine has a 100A fuse..look into getting new wire plus my wire is 4 gauge.., 1600 watts is too powerful for a 12 g wire and a 30 A fuse