My new Alpine KTU-445U amplifier is not working

This link may be of help: http://www.vulcanbagger.com/forums/showthread.php?t=13049

There is a short either within your speaker wires or amp connections causing your amp to overload. If it's not either mentioned, then most likely your amp is shorted internally which you will need to take to a shop for diagnosing.

Please let me know if you have any questions, and thanks for using FixYa.

2004 Toyota RAV4 Car Stereo Radio Wiring Diagram Alpine wire color
Radio Constant 12V+ Wire: Blue/Yellow yellow
Radio Ignition Switched 12V+ Wire: Gray red
Radio Ground Wire: Brown black
Radio Illumination Dimmer Wire: Green none
Radio Antenna Trigger Wire: N/A blue
Radio Amplifier Trigger Wire: N/A blue/white
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Wire (+): Pink white
Left Front Speaker Wire (-): Purple white/black
Right Front Speaker Wire (+): Light Green gray
Right Front Speaker Wire (-): Blue gray/black
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Wire (+): Black green
Left Rear Speaker Wire (-): Yellow green/black
Right Rear Speaker Wire (+): Red violet
Right Rear Speaker Wire (-): White violet/black

Go to the store and buy a mounting kit and wiring harness adapter that are for your car. There are alot to choose from and most are universal and come with instructions. You can get these at wal-mart or best buy. The mounting kit is meant to fill in the empty space left by the new aftermarket radio (your alpine). The alpine will have a metal sleeve around it. take this off and put it in the mounting bracket so it is flush. The sleeve will have little triangle shaped tabs on it. Bend these out so the sleeve cant fall out of the bracket or someone will be able to pull out your radio. Remove your stock radio by pulling off the trim around the radio. This is held on by clips, so be careful. There will be a couple of screws holding in the radio. Remove these and pull the radio out. Behind the radio there will be 1 or 2 wiring harnesses plugged into the radio. Unplug these. Then attach the wiring harness adapters you bought. These plug into the stock harness and have wires at the other end that are labeled. Wire the alpine wiring harness into the harness adapters that you plugged into the stock harness. If you want to you can unplug the harness from the alpine and wire it to the harness adapter before plugging it into the stock harness. The wiring diagram should be on the radio. If not the colors are pretty common.
RED = SWITCHED PWR LEAD (IGNITION)
ORANGE = ILLUMINATION
BLACK = GND
YELLOW = BATTERY LEAD
GREY = FNT SPKR RIGHT(+)
GREY/BLACK STRIPE = FNT SPKR RIGHT(-)
WHITE = FNT SPKR LEFT (+)
WHITE/BLACK STRIPE = FNT SPKR LEFT (-)
VIOLET = REAR SPKR RIGHT (+)
VIOLET/BLACK STRIPE = REAR SPKR RIGHT (-)
GREEN = REAR SPKR LEFT (+)
GREEN/BLACK STRIPE = REAR SPKR LEFT (-)
BLUE = PWR ANTENNA LEAD
BLUE/WHITE STRIPE = REMOTE TURN ON LEAD(FOR SUBWOOFER AMPLIFIER)
There may be RCA jack inputs in the back and these are for the subwoofer amp.
There will be a large black cable in the back and this is the antenna wire. Plug in the antenna wire from the back of the stock radio here. Yu may or may not need an adapter for this depending on the size difference between the wire and the hole it plugs into.
**Please note: if your car has a "premium" sound system that comes stock with an amplifier you will need to attach the power antenna lead from the alpine to the remote turn on lead on the harness adapter. If not when you turn on the radio/cd it will not turn on the stock amplifier and the speakers will not work.
I found this out with my 99 dodge avenger which has an Infinity stock radio. You can pop the trunk and look up at the back dash and see the small amplifier.
Once the radio is wired and the mounting bracket is installed, connect the harness adapter as well as the antenna wire. The new wiring harness adapter makes the wiring a little longer so you may have to stuff them back a little bit. Connect the harness from the alpine back into the back of the radio and slide the head unit into the metal sleeve until you hear a click. Before sucuring the mounting bracket and putting the trim back on it is a good idae to try the radio out so if there is something wrong you dont have to disassemble it again. When you buy the harness and bracket it will say on the packaging "nissan 84-94" or "Honda 83-99" or something similar. Look on the back for a complete list of compatable models.

Hope this was helpful. Please rate, and thanks!

YOU MAY BE ABLE TO GET A HARNESSADAPTOR. IF NOT GET AN "ISO" PLUG FROM YOUR FACTORS, AND FOLLOW THE INSTRUCTIONS ON THE PACK, 1 PLUG IS THE POWER PLUG SO FIND THE SWITCHED LIVE, CONSTENT LIVE AND GROUND FROM CAR SOCKET. THE YELLOW IS CONSENT/MEMORY RED SWITCHED, BLACK GROUND EARTH, THE SPEAKER LEADS ARE PAIRED BY COLOUR YOU CAN TEST THESE WTH A 9V BATTERY TO FIND WHICH ONE IS WHAT, THE SPEAKER WILL BUZZ

dnt get confused, follow these simple wiring .......
firstly cut off the old lug from the connected place, make sure you cut each wire seperatly....and you are going ti use the wiring agin, avoid making the wires shorter...
YELLOW..12V+ DIRECT FROM BATTERY...can be joined where alpine yellow was conected.
RED...12V+ IGNITION WIRE..can be joined where alpine red was connected
BLACK 12-, NEGATIVE....BODY GROUNDING
ALL SPEAKER WIRES HAVE +AND-, PURPLE/PURPLE----------WHITE /WHITE-------GREEN/GREEN.......GRAY/GRAY..ALL THESE ARE SPEAKER WIRES, COMPARE THE CONNECTION OF ALPINE AND FOLLOW THE COLOUR FROM APLINE LUG AND JOIN THE PIONEER LUG ....THEY HAVE BAISC COLOUR WIRE AND AHVE SAME TYPE CONNECTION..DO IT

go towalmart and buy a scoshe wiring adapter follow the instructions

What AMPlifier are you using? Where is the main power wire and ground wire for the amp connected? (an amplifier with 25Wx2 or larger should be connected with proper fused wire directly to battery). I would check the fuses in your car as well (when the ignition key turned ON you should have power both to the Yellow wire and Red wires on the Alpine radio, there will be two fuses you must check in the car if not but I have no idea what car you are driving (one will be the radio fuse) (the second could be marked radio 2, or clock, or lighter ... or a host of other things) so I cannot tell you which ones to check, so look in your vehicle owners manual it should help. What did you connect the Blue / Whte wire from the Alpine radio to?