I'm retired and had some prior bad car luck, so I thouight I would go back to an older Mercedes. The 240D, 300D's were always dependable. I picked the wrong car. The 92SD uses oil, the turbo quit, cruise quit and the A/C went out. So I'm starting with the AC. I flushed the system, replaced the compressor (new Denso 20C)/drier etc. but I can't get any power to it. It's a the speed sensor in the bottom. Is there a relay or line fuse? Thanks