Hi New member here and this has probably been asked a million times. I have a 95 80 series with CDL and Front and Rear lockers. The CDL and Front locker are working just fine but I cannot seem to engage the Rear locker. I have preformed all the "tips an tricks " suggested that I can find. The Centre and Front are definitely engaging, Centre ECU on right side of vehicle clicks and diff engages, can feel drivetrain wind up when moving so it is working fine. Front locker ECU on left side of vehicle clicks and diff engages, steering heavy as you would expect. When I go to Rear lock there is no Electronic click and no diff engaging noise. I have had Landys with the locks on the wheels before but not with electric lockers. I am going to investigate the left and right kick panels for the ECU's but would appreciate any thoughts on this problem. I have driven vehicle for a good distance with the lockers that are working engaged and the rear switch On but nothing happens. I suspect it is electrical more than mechanical but any help would be appreciated.