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strange wires on back of 740 radio 700

posted by  AUchet on  Sat Jun 28 03:44 CST 2003
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I just aquired a 740GL and I want to put my pioneer head unit in it. I pulled out the factory stereo, and besides the cable with all the speaker wires and 12v etc on it (loom?) and the amplifier cable, there are 4 other wires that are connected to the back - I have no idea what these are.

One is connected to the radio via a bullet plug, the other three connect to the chassis of the radio via a screw (they have a ring connecter which goes under a screw and connects to the radio chassis). One of these three has what seems to be a capacitor connected to it. They are all black and of different thicknesses.

I pulled the factory stereo out, and after a while deceided the new head unit project was going to take too long for today, so I put the volvo radio back. But I couldn't remember where these abovementioned "strange" wires went. They all seemed like earth wires, so I just screwed them to the back chassis of the stereo.

Since then the car has had quite a bit of trouble starting. The first time this happened, the car wouldn't start at all. I pulled all the wires off the back of the stereo, and like magic - the car started.

Does anyone know what these wires are for and why they're causing my car to not start?

I dont want to go and put my Pioneer stereo in and find that these wires needed to be connected...








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    strange wires on back of 740 radio 700

    posted by  chris herbst on  Sat Jun 28 03:56 CST 2003
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    last visit: Mon Oct 20 20:32 CST 2014
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    Check your headlights, too.

    The wiring to the 700/900 series radios is purely STUPID. I'm sure they had a reason, but whatever reason it was, causes headaches beyond belief.
    --
    Chris Herbst, near Chicago.








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      strange wires on back of 740 radio 700

      posted by  AUchet on  Sat Jun 28 04:16 CST 2003
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      why do I need to check my headlights?

      so any ideas what these wires are?








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        strange wires on back of 740 radio 700

        posted by  chris herbst on  Sat Jun 28 11:26 CST 2003
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        last visit: Mon Oct 20 20:32 CST 2014
        [RELATED]

        Because... if I'm not mistaken, the whole headlight circuit on certain years (maybe all) is dependent on a connection made somewhere back there and it has to do with the stereo wiring. I coul dbe wrong but I recall that being discussed. I tried to look it up in the green manual, but the headlamp circuit is a disaster and no offense, but I'm not spending an hour deciphering a clusterf$#k of a stereo and headlamp circuit. If you want, don't check... but don't be surprised if they don't work.
        --
        Chris Herbst, near Chicago.







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