Two 686's and one 695. Only the the 686's were compatible until we had to convert over to the single point hookup. They are all the same now. Have ya happened to spill anything on your armrest? My cab roof leaked on the 9750 and water dripped from the speaker mounting hole and shorted me out once. Needless to say that leak was fixed pretty darn quick. Them stupid boards do funny things when they're  toast. Good luck again.