Join Date: Mar 2005
Location: Medford, Oregon, USA
The speedo encoder is such a low level signal, it seems unlikely to contribute to radio noise. I see no supressor/condensor in the schematic. I know that regulator switching can get into the radio signal. Are you saying you get the noise at wheel speed, no matter what gear you're in? Confirm whether it is related to engine rpm, and if it is, try cleaning up as many grounds as you can find. That ground at the triangle engine mount, is suspect, as well as the grounds at regulator. Sounds like a "ground loop" problem. Might refresh the radio contacts at back of radio, also.
Knicknacks by Eric of Holland (former LTD rider)
80 Int., 85 Int., 85 LTD, 90/2000 1500, and now a 2006 Nav, Cabernet Red