the sony unit did have a trigger wire but the non-bose harness (from the car plug to the radio wire harness) does not have the wire (or more importantly the pin). if you go to crutchfield the non-bose harness come with 2 extra blue wires; one for the amp trigger and one for the antenna.
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Originally Posted by 97 SL320
I'm pretty sure the wiring on the stock radio conforms to an ISO standard.
I'd have to see a wiring diagram but the aftermarket unit should have an output to trigger / wake up the external amp. I doubt this wire can power the amp so the amp must have an external power source.
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