After my post I found this Becker h/u diagram you also referred me to.
All of my factory speaker connections are in the brown plug (socket B), which are the speaker level outputs. My factory wiring for socket C (yellow plug) line level outputs has no speaker connections, just a ground wire, as I recall. So it looks like the speaker level outputs were going from the Becker to the factory amp, which doesn't seem to make sense.
It's been many years since I've installed a stereo, but I always thought amps took line level inputs because the unamplified signal's cleaner. Crutchfield's instructions also explicitly say to use the RCA line level outputs. So I guess I'm going to rig up the new h/u line outs to the adapter harness and see how it goes. I'll report back whatever I come up with.
I welcome comments from anyone else who's been through this or had similar experience.
Thanks,
Gary
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