Head Unit Confusion

[Dr_Strangelove]

Greetings,

I have a 92 XLT Explorer. The head unit was removed (stolen) before I got the truck. I'm having some confusion on figuring out just what audio system this model had. The factory wiring harness was cut and the connectors were missing. I went to the junk yard and found the same year vehicle but the radio (HU) was already pulled. I did manage to snag the two connectors that match up color for color with the wiring in the truck.

The first inline 8 pin connector is obviously the power/ground/ignition/lights/memory cable. I have that one figured out.

The second cable is a 8 conductor grey shielded cable that I'm quite sure is the one that goes to the factory amp. The connector that belongs on this shielded cable has 8 pins (2 rows of 4) plus shield (not the 16 pin connectors that I have seen pinouts for). I need the pinout for this 8+ amp cable connector. I have not yet pulled the passenger rear panel off to check out the amp (but I assume it's still there).

The colors I have are as follows:
Green
Yellow
Blue
Brown
Blue /w black stripe
Purple/w white stripe
White/w red stripe
White/w orange stripe

This is not the JBL or Infinity as I have no sub woofer.. and I'm guessing it's not the basic unit cause it is the only one with the amp in the head unit. I'm thinking it is the premium or Lux but the info I've seen does not match the connectors.. Anyway.. you don't normally run 28 gauge shielded cables to speakers

Unitl I have more adaquate funds to do the system right, I'd like to just find the amp trigger wire and make an adaptor that I can plug my MP3 player into into the factory amp inputs. The factory amp and speakers will get me by till I select a nice new aftermaket HU, speakers, and sub amp/box.

Thanks in advance for any advice

 

[Dr_Strangelove]

Update: I figured out that the blue wire on that inline 8 pin connector is the amp trigger. Managed to get the amp to turn on. That was half the battle..

The 8 wires on the grey shielded cable are now a bit less mysterious. 4 pairs of 2 wires. One pair for each channel. Signal and shield (line level) or positve and negative (balanced audio). Judging by the other diagrams that I've seen, it will be balanced (FR+ FR- FL+ FL- etc)

And I also have I dentified what channel each pair drives. the polarity is still an issue but I guess a little more experimenting will discover the correct phase. I'm not sure now that my MP3 player will have enough Oooomf (voltage) to drive the inputs of the stock amp though. Maybe at a reduced level.

 

[jimbo74]

the factory amp doesnt need much pwer if any to work... in fact, the headunit didnt have its own output power... so its jsut basically a really low power signal.....