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Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Purple Right Front Speaker Wire (-): Light Green Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
To check for yourself, get an Ohmmeter and see if the outers of the amplifiers RCAs are connected to the ground or each other. If so then it cannot take speaker signals directly.
I suspect the 'High Level' the manual speaks of are the 4volt auxilliary audio signals that can be found on some newer head units, not speaker signals.
Speaker level signals from a bridge amp CAN be used on grounded RCA inputs if the signal is first passed through a simple decoupler and attenuator.
Diagram to explain....
there is a round connector coming off the battery cable its a single large gauge wire and is about level with bottom of battery the come unplugged sometimes or battery acid eats them
give that a check
if you are going to place the speackers into the rear shelf than you can run your wires along the underside of the shelf,then towards the back of the rear seat, then run it down the length of the seat, when you reach the bottom you will need to try to pry the backrest portion seat foward just enought to get the wire thru to the front, then you will need to get either a phillip or slotted screwdriver, open the back door and at the bottom unscrew the trim from the bottom of the door way,run wire thru do the same with the front door, then run wire behind the trim around or near where the emergency release handle is at, run wire behind instrument panel towared your deck. when you go to wiring up the deck and speakers check on the deck to see if it has a wiring diagram on it if not: most decks come as follows ( white wires front right ,blue or purple rearl left, brown front left, grey rear right red is + black is - yellow is constant +( always on so your deck is able to stay programedwith your presets and audio settings and clock)one single blue or purple wire is the remote for your ampif the colors dont match the ones on your deck then hook up your deck to the power only when the deck comes on go ahead and set your speackers to only the rear right speacker and take your wires from your speacker and touch them to the wires on the back of the deck, once you hear the audio coming thru go ahead and mark this as right rear or rr then using the same speaker change the settings to rear left speacker and do the same as with the other one mark it rl and do same for front speackers
are you using and after market harness to go from your bronco to the harness to the new radio. if so make sure all the colors are matched up (e.i. purple to purple, purple/black to purple/black). did the speakers work before the aftermarket unit. Also check the wiring at the oem speakers
my 83 bronco has no wiring, i just replaced the pump today it was a mechanical pump. easy to replace after removing power steering pump. just remove the two bolts holding it in.
It's possible (probable) that the head unit has a blown internal amplifier IC. Measure the DC voltage on each of the 8 speaker wires on the head unit. Place the black lead on the chassis of the head unit. Probe each wire with the red lead. All should read approximately 1/2 of the voltage on the yellow wire. If you get some that are significantly higher or lower, disconnect all speaker wires from the harness and measure again. If the voltage is still not ~1/2 of the voltage on the yellow wire, the IC is almost certainly defective.
For the external amp, you need to check the shield ground for the head unit. The following page shows you how.
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