FIXED IT !!!!!!!!!!!
Turns out, the reason yams do this is cos a fault on the 'back up' circuit. If u trace from the fuse under the seat, up towards the nose cone u will come to the multi plug. i don't know about the R6 but on the R1 its pin7, red/green/white square coded wire. there was some green corrosion in the plug and when i did a continuity test the pin crumbled in the plug. pulled out the remains, removed the pin and made a new one (2 bootlace crimps soldered together). its all back together and working fine now.
hope this is of use to anyone who is having a similar problem