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Look this is a very very simple fix. You have what is called a remote wire coming from the radio is usually the red and or the yellow wire what's happened is your remote wire which allows memory to stay on the radio is ran to your switch. You must eliminate your hot wire to your switch and run a hot wire off of your factory plug in to the remote wire on your radio. This will fix this issue.
1998 Mercury Mountaineer Car Audio Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Light Green Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Black Car Radio Illumination Wire: Light Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: Blue Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 6? x 8? Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Orange/Light Green Left Front Speaker Negative Wire (-): Light Blue/White Right Front Speaker Positive Wire (+): Dark Green/Orange Right Front Speaker Negative Wire (-): White/Light Green Car Audio Rear Speakers Size: 6? x 8? Car Audio Rear Speakers Location: Rear Doors Left Rear Speaker Positive Wire (+): Gray/Light Blue Left Rear Speaker Negative Wire (-): Tan/Yellow Right Rear Speaker Positive Wire (+): Orange/Red Right Rear Speaker Negative Wire (-): Brown/Pink
connect the red wire of the amp to a car battery (+). the black to a car metal and the remote cable to the blue wire in radio. when you turn on the radio the amp turn of--when you turn off the radio the amp turn off.
Remove all speaker inputs and outs and just have your 12volt battery, ground and radio remote connected and power up the amp. If it turns red instantly, then the amp is shorted/blown. If it stays green, then install your speaker inputs and outs one at a time. make sure your amp is on while your doing this. if the amp goes into protect mode, take note of which wire it was for it's most likely shorted. Fix that shorted wire and the unit should stay on.
check to see if the remote wire has 12 volts when you turn the vehicle off. if so that is whats causing it to stay on. check your radio or where ever the remote signal is coming from. if the remote wire does not have 12 volts when the car is off, then there is something wrong with the turn on portion of the amp and needs to be repaired or replaced. good luck
There should be 3 wires on the power side of the amplifier.
Ground - to the car chassis
Power - to the car battery
Remote - to the remote turn on lead from the head unit. (this emits a 12V signal to a relay inside the amplifier for it to turn on when the radio does)
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If you have a volt meter or a test light you can use it to see if you have some voltage on the remote terminal on the amp.
If you do not have either of those items, just disconnect the remote wire and see if the light goes out.
If the light goes out, you have voltage coming from your radio that is keeping the amp turned on, that is normally a problem with the radio. The remote output of the radio may have a shorted transistor in the circuit.
If the light stays on, you have a problem with the amp. It is rare to have an internal electrical problem with an amplifier and the amp still works normal. That is not to say it can not happen, there may be a component that is shorted in the turn-on circuit of the amp that is isolated to the turn on cicuit only, and it keeps the amp on all the time.
This will become a big problem soon if not repaired. If the amp is staying turned on even when the car is off you will drain your car battery rather quickly. Most amplifiers will draw between 1 amp and 2 amps of current with no signal applied, this is called the idle current.
Find out which unit is causing your problem and take it to be repaired, it is most likely an electrical problem that will need good electrical troubleshooting skills to locate.
If you need any more help with this feel free to ask, with the model number of the unit at fault I can even find you some likely suspects to be checked.
Don't forget to give me a "FixYa" if this information turns out to be helpful.