Buddy has a 1986 Evinrude remote on his pontoon. When on trailer remote is put into forward or neutral or reverse every thing works as it should. don't matter if you check by hand with motor not running or with the motor running with ears on for cooling. But when you put in water it will go into forward and neutral fine but when you go to reverse it will just chatter as if teeth are not in gear or motor is at high RPM so it can get into gear but motor is at idle speed. New cables have been put on and adjusted correctly. Hope I give enough information for an answer. Any questions I will try to answer. Thanks