teletiger, 2 quick things to check. 1. Since it has a rubber boot for the plug, make sure its fitting correctly, very easy to place the boot off to the side slightly and the metal connector will go beside the plug end, not over it tightly. 2. Make sure the braided wire at the plug end of the wire is crimped tightly in its sleeve and screwed down tight to the head. Both of these can give intermittent problems with the radio but the the engine may still run fine.

Ed M.