No place for amp to go in headunit

Did u check the fuses for radio and the amp itself, that's the most common thing when changing a radio or amp with a vehicle with an amp in it

wires to A/C commutter not correctly connected or A/C commuter broken. Replace it with the old one, on the old headunit

It should be blue/white.

All amps are basicly the same. It should be plain as day where the speakers connect to.
The 12V screw connects to the main power from battery, be sure to fuse that wire and use a proper size wire, thicker is better,I suggest at least 8gauge with 40amp fuse. The GND is ground and should connect to car metal, file paint for soild connection. The REM is remote and connects to the remote of headunit or if you have a stock deck to the acc of car found in wire harness of headunit. Plug in the RCA's to head unit, or get a converter to plug into speaker wires from car if you have a stock headunit.

Its quite simple. Just go to any hardware, or electronics store and purchase a small toggle on off switch. Find the rem wire where it runs from the back of the headunit to the amp, and wherever its easy to reach simply cut the wire, Strip the two ends of the wire and mark the piece still connected to the head unit +, and the one connected to your kenwood amp -. Next Find a suitable place to mount your switch, (probably somewhere close to the drivers seat). Mount the switch, but make sure you can reach the terminals on the switch. Then Splice a wire from the + end of the cut remote wire, to the + end of your switch and connect it.(if the switch's terminals aren't marked +, and - just pick one and call it +, and the other -, it doesn't matter) Next run a wire from the - end of the cut remote and connect it to the - switch terminal. Then you're done... Just remember for your amp to be on both your headunit and switch have to be on. Also while your wiring disconnect the - terminal of your car battery to avoid shorting anything. Also discharge your capacitor if you have one. Enjoy you system!

High input is used for amping up doorspeakers if your headunit doesnt have enough preouts

for instance you would connect up the rear speakers to the high input lead acting as a rca

Hope this answers your question :)

The remote wire on the jvc unit is blue/white stripe if that isn't there it's the blue wire

Hello dobbyville11,
It might be a few things but here is what i would check 1st, pull out the head unit make sure all the wires are pushed in all the way. The second thing i would suggest is checking the connection to the battery and ensure that the ternimals are clean and a good connection is available.
If there is something else it might be that you hold down a button while it starts, I know of some headunits that need this.
Please post what you do and how you did it. I look forward to your post.

Check your ground wire! Relocate it to another place in the car and try to get a heavier ground wire aswell.