So I have a hard wire setup in my car. I literally cut up the cord that came with the detector and added some 18 gauge wire to wire it to my fuse box and whatnot. The wires for the mute button are smaller then 18 gauge but the power and ground are 18 gauge through and through. My 940 seems to work fine, but my RX-65 does the self call and sometimes the time for service thing. My RX-65 is new, I bought it from the official ebay refurb store. I am wondering if it is my wiring or if it is the detector and I should send it in.