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It will be the boost cap near the power switch. 220if 35v. In fact 3 caps die which kill XTi and CDi series. Amps. 2 x 220ugf and one 470 uf. All. Located yon the freuont right edge of the main PCB.
Depending on the configuration of speakers you have it will deliver different amounts of power up to 1950 watts when used to power a single 4 ohm speaker. Typical usage would be powering a pair of 8 ohm speakers, in which case it will deliver 400 watts per channel/ speaker.
Got this from http://www.modifiedlife.com/1990-ford-crown-victoria-car-stereo-wiring-schematic/ I have used this site before, and the wiring guide was accurate for my grand marquis Car Radio Battery Constant 12v+ Wire: Green/Yellow Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Chassis Car Radio Illumination Wire: Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 5 1/4? Speakers Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Orange/Green Left Front Speaker Negative Wire (-): Black/White Right Front Speaker Positive Wire (+): White/Green Right Front Speaker Negative Wire (-): Black/White Car Audio Rear Speakers Size: 6? x 9? Speakers Car Audio Rear Speakers Location: Rear Deck Left Rear Speaker Positive Wire (+): Pink/Green Left Rear Speaker Negative Wire (-): Pink/Blue Right Rear Speaker Positive Wire (+): Pink/Blue Right Rear Speaker Negative Wire (-): Green/Orange
2000 Ford Crown Victoria Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Violet/Light Blue Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Black/Light Green Car Radio Illumination Wire: Light Blue/Red Car Stereo Antenna Trigger: Blue Left Front Speaker Positive Wire (+): Orange/Light Green Left Front Speaker Negative Wire (-): Light Blue/White Right Front Speaker Positive Wire (+): White/Light Green Right Front Speaker Negative Wire (-): Dark Green/Orange 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
Before asuming it is the power transistors check the power on relay first as mine had the same proble and it was because of the Relay that did not switch on the one channel or amp (remember this is a power amp and consist of two mono amps)
Have you swapped the speakers around to eliminate them as external causes?
When the channel dies is the unit very hot and is the fan turning very fast (it should be if hot)? The fan could be defective, slow or airflow may be restricted.
Turn the amp off and examine the fan guard on the rear to make sure it is clear of dust and debris. Vacuum it out if necessary. With a small thin non-metalic object reach in and test the fan for free movement by trying to rotate it. It should coast.
Is it clipping for real or overheating ? It may just be a fault with the indicator light circuitry itself.
Make sure the input levels of the amp are matched with the output levels of whatever device is running into the amp, they will either be +4 dbm or -10 dbu, if you have a choice you want them to be set at +4 dbm.
Crowns are professional amplifiers and withstand years of hard touring on the road, it would definitely be worth it to take it to a good repair shop if you can't remedy the problem yourself.
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