Here's my solution for my '87 325is with premium sound - it doesn't have the same fader switch (with + and - to each speaker) mentioned in the first thread so it's slightly more involved:
Step 1 - get the Electrical troubleshooting manual for your year/model. It's online. It's free. Print out the appropriate 2 pages. If you skip this step you are really dumb.
Step 2 - everything else.
To bypass the amp You need to run new wires to the front speakers and re-purpose the wiring to the amp/rear speakers so you don't have to run all new wires to the rear. Keep track of your polarities according to the "Speaker wire color" list in the original post.
Fronts:
Left +: Cut the gray/red a few inches from the connector at the kick panel speaker and run your positive to that. the other end of the gray/red is coming from the amp. it's dead to you now. Leave it dangling.
Left -: Splice your negative INTO the gray/violet. I cut the wire a few inches from the speaker connector, stripped both sides, and put both sides into one side of a blue butt connector. I put my new speaker wire negative into the other side of the butt connector. Yes, a long section of wire coming from the amp will now be dormant, but I didn't want to track down where the splice connector was. Besides, Electricity, like the honey badger, don't give a shit. You'll see what I mean when you look at the wiring diagram.
Right +: Positive to the gray/white as before.
Right -: Negative spliced into the gray/brown, 3-way style, as before.
Rears:
Basically you're re-purposing the 4 wires that go from the fader to the amp and instead using them as speaker wires. They're Yellow/black, yellow/red, blue/black, and blue/red. Re-Assign them to be your Left rear +, LR-, RR+, and RR- however you see fit, but write it down. These 4 wires go into the amp, which spits out 4 wires to the rear speakers (which you'll use) and 4 wires to the front speakers (which are now dead since you ran new wires to the front). So, you use your butt connectors to jump the 4 amp input wires to the appropriate 4 amp output wires going to the rear speakers. voilla! Instant speaker wires from the fader to the rear speakers, ready to go.
Left rear +: black/brown at connector position 7 (see the tiny numbers on the face of the connector to the amp)
left rear -: black/violet at 1
right rear +: black/white at connector position 5
right rear - : black/brown at pin 4. Note there are a couple black/brown so look at the numbers.
Good luck. Recheck my work before you do it yourself.
Step 1 - get the Electrical troubleshooting manual for your year/model. It's online. It's free. Print out the appropriate 2 pages. If you skip this step you are really dumb.
Step 2 - everything else.
To bypass the amp You need to run new wires to the front speakers and re-purpose the wiring to the amp/rear speakers so you don't have to run all new wires to the rear. Keep track of your polarities according to the "Speaker wire color" list in the original post.
Fronts:
Left +: Cut the gray/red a few inches from the connector at the kick panel speaker and run your positive to that. the other end of the gray/red is coming from the amp. it's dead to you now. Leave it dangling.
Left -: Splice your negative INTO the gray/violet. I cut the wire a few inches from the speaker connector, stripped both sides, and put both sides into one side of a blue butt connector. I put my new speaker wire negative into the other side of the butt connector. Yes, a long section of wire coming from the amp will now be dormant, but I didn't want to track down where the splice connector was. Besides, Electricity, like the honey badger, don't give a shit. You'll see what I mean when you look at the wiring diagram.
Right +: Positive to the gray/white as before.
Right -: Negative spliced into the gray/brown, 3-way style, as before.
Rears:
Basically you're re-purposing the 4 wires that go from the fader to the amp and instead using them as speaker wires. They're Yellow/black, yellow/red, blue/black, and blue/red. Re-Assign them to be your Left rear +, LR-, RR+, and RR- however you see fit, but write it down. These 4 wires go into the amp, which spits out 4 wires to the rear speakers (which you'll use) and 4 wires to the front speakers (which are now dead since you ran new wires to the front). So, you use your butt connectors to jump the 4 amp input wires to the appropriate 4 amp output wires going to the rear speakers. voilla! Instant speaker wires from the fader to the rear speakers, ready to go.
Left rear +: black/brown at connector position 7 (see the tiny numbers on the face of the connector to the amp)
left rear -: black/violet at 1
right rear +: black/white at connector position 5
right rear - : black/brown at pin 4. Note there are a couple black/brown so look at the numbers.
Good luck. Recheck my work before you do it yourself.
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