Thanks - that is pretty much everything I needed to know. It also explains why it hadn't worked. It came from an 88' 560SEL and I tried it in a 85' 300SD. I'll try resoldiering my old one.
No rush on all of this project though, I just spent a couple of hours over the last few days with my head under the dash extracting and replacing the expansion valve and flushing the evaporator. I need to finish the A/C project first. Access to the cruise control module seemed rather easy comparatively once I was down there and during a moment of frustration I felt like I needed to accomplish something and trying out the other amp was it.
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