"Common" Wire in wiring diagram for Becker Amps (BE1423 / w124) - Mercedes-Benz Forum
 
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post #1 of 3 (permalink) Old 07-08-2019, 06:39 AM Thread Starter
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"Common" Wire in wiring diagram for Becker Amps (BE1423 / w124)

OK I have to sheepishly admit that I don't understand the wiring diagram for our cars here.

I have a basic consumer level understanding of this stuff --- meaning --- I understand that each channel of sound usually has two wires, like if you use RCA plugs in the back of your home amplifier, then each RCA plug is actually 2 wires - one wire for the "tip" and one wire for the "barrel".

So I was looking to grab sounds from *after* the factory fader wheel in our cars (to feed an aftermarket amp) --- and I don't understand this wiring diagram. For two channels of sound, why are there only 3 "wires"? One of the wires is "common" for the 2 channels of sound? What? Why is this done? And, what should I know about this if I tap these to get a low level signal? I have attached the wiring diagram here with arrows pointing to the areas in question.

Thank you.
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post #2 of 3 (permalink) Old 07-09-2019, 07:22 PM
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They have common ground. You can split the common wire to the barrel of your RCAs or ground to the chassis like the good old Pioneer pico fuse fix.

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post #3 of 3 (permalink) Old 07-10-2019, 08:18 AM Thread Starter
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Thanks!
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