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That usually causes a whole heap of troubles because the amp and radio are connected to the BCM and are part of the computer system. Things like turn signal clickers and door open chimes are actually part of the radio / amp system.
You can go to www.bbbind.com an get free wiring diagrams an TSB's Technical Service Bulletins Click on Technical Information then Technical Service Bulletins & Wiring Diagrams - Then you will see this END-USER LICENSE AGREEMENT , go to bottom of the page an click on I Agree next page you'll see this ..
Here's a link to your charging system,it shows a fusible link inline with alternator,follow wiring leaving your positive side of battery,link could be melted or burnt.
Make sure the remote wire is hooked up. You can run a small wire from the power terminal to the remote terminal. If it powers up, then you have a remote wire problem. You can run a remote wire from the blue power antennae wire of the deck.
If it is an active converter and not passive, you should have three power wires, black goes to ground, yellow to battery, and red to the remote/amp (blue) wire off the deck. Then there should be four input wires. These connect to your speakers, white-white/black to left, grey-grey/black to right. Black line indicates ground, or (-). Then simply hook up the RCA jacks to your amp! Caution: the Scosche only accepts 80w of power, 40 per channel. Otherwise you rick blowing the converter, possibly the amp (usually a mosfet), and then possibly the subs, though not likely.
1991 Ford Explorer XLT Radio and Speaker Wire Colors
Pulled out the stock radio and found two plugs on the back of it. One plug had 7 wires (Power, Dimmer, Amp etc.) and one had 8 (Speakers).
7 wire plug (I could see these wires immediately from the plug):
Car Radio Battery Constant 12v+ wire = Light Green w/ Yellow Stripe Car Radio Ground Wire = Black Car Radio Accessory Switched 12v+ wire = Yellow w/ Black Stripe Car Radio Dimmer Wire = Light Blue w/ Red Stripe Car Radio Illumination Wire = Orange w/ Black Stripe ?? Don't know ?? Red Wire (No power to wire Constant or Accessory) Car Radio Amp Wire = Blue
8 Wire Plug (Wires were wrapped in a grey outer sleeve, had to cut sleeve to get to wires.):
Right Front: White w/ Green Stripe (+) Brown (no stripe) (-)
Right Rear: Purple w/ White Stripe (+) Light Blue (no stripe) (-)
Left Front: Light Green (no stripe) (+) White w/ Orange Stripe (-)
Left Rear: Light Blue w/ Black Stripe (+) Yellow (no stripe) (-)
Speaker Wires (found at the individual speakers in the doors)
Right Front: White w/ Green Stripe (+) Green w/ Orange Stripe (-)
Right Rear: Orange w/ Red Stripe (+) Black w/ White Stripe (-)
Left Front: Orange w/ Green Stripe (+) Blue w/ White Stripe (-)
Left Rear: Red w/ Green Stripe (+) Red w/ Blue Stripe (-)
U have a Factory audio auxiliary amp in the truck, the radio is just a head unit with a preamp feeding a main amp, that is behind the right rear 1/4 panel trim panel in the cargo area, if your new sound unit has preamp outputs use them, other wise u must wire around the Ford factory amplifier.
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