i just installed my 900BT and everything works fine. the only problem is that when i preset the radio and do the BSM, the next time i use the unit the presets are gone. even the AV1 setting. its quite annoying. i read in another post that the battery wire could be resetting the memory every time. i have the yellow battery wire hooked to the yellow wire on the radio harness, or do i need to wire it to another source?