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Re: Remote lead voltage
I would say it is. Did you disconnect the blue lead from the amp then measure the lead for 12v? I just hooked one up for my son and the blue lead was the 12v that turned the Switch Mode Power Supply in (SMPS) the Amp, now, it's only present when you turn the radio on, it's not full time. If all this is done and you don't have 12v on the blue lead, I would look for a in-line fuse close to the radio. Now, if that fuse is open I wouldn't be surprised if the amp is gone also. If it was under 150.00, I would'nt have it repaired, just buy another one. My son was forced to do that because the parts were almost 1/3 the price of the amp, at my cost! Keep in touch.....
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Are you running your rear speaker through an amplifier? If so, you are probably using the blue wire (power antenna remote turn on) instead of the blue/white wire (amp remote turn on). The blue wire turns off when leaving tuner mode, thus turning off the amplifier.
1.verify connections...Make sure your ground wire is grounded to a location on the body where you will sand the paint away to make good metal to metal contact.
2.with a volt meter check for battery voltage on the red wire of the amp as close to the amp as possible.verify that your remote or trigger wire from the radio (blue wire) id connected to the remote terminal of the amp.. turn on key switch, turn on radio and see if amp powers up. if no then verify 12 vdc at the remote terminal of amp, very 12vdc at red power wire. verify ground. If all this is good i would suspect you have a faulty amp.
it sounds like you are using an amplifier. if so, make sure you are using the blue/white wire to turn the amp on instead of the blue wire. the blue wire is antenna remote and turns off when leaving tuner mode. the blue/white wire is amp remote.
are you running the audio through an amp?? if so, it sounds like you are using the antenna remote wire(solid blue) instead of the amp remote wire (blue/white stripe) to turn the amp on. when listening to cds the antenna remote turns off.
facing the back of the 7940 the top left corner is pin 16 the top right corner is pin 9. The bottom left is pin 8 and the bottom right is pin 1. Only a few of the 16 pins are used due to this unit only having pre-outs, no internal amplifier on this unit. Pin 1 red (ignition), Pin 2 pink/black (interrupt), Pin 3 orange (Illumination), Pin 8 black (ground), Pin 9 blue (power antenna), Pin 10 blue/white (remote turn on), Pin 16 yellow (battery).
Your amp is not turning on - what you should do is connect the "blue/white - remote turn-on lead" to whatever wire you have the "blue - power antenna" output from the Alpine connected to now. That should solve your problem.
you would need rca cables, power wire, ground wire, and remote wire. it is easiest to just go to your local best buy or circuit city stores and buy the whole set in one package. rca's lead from your decks rca output jacks to your amp, remote wire leads from your decks wiring (blue remote wire that leads to your deck itself to give it remote) or any 12 volt source like where your fuses are located and it runs to the amp also, your power wire will lead from your battery to your amp, and your ground will need a good place somewhere in your car and be bolted or screwed to the frame of your car. this is how to intall your deck to your amp. i assume that you already know that wires will have to be under your carpet or kickboards and such however you run them. i think this covers the basics and i hope i have answered your question right, good luck