SRAD 600 Rondom No Power Issue, Please Help!
 

I have a 2000 SRAD 600 that was running perfect and never gave me any issues until the other day. Started bike to leave and while it was warming up it just died, no power to anything guages,fuel pump, headlights. thought it was the battery so put it on the charger but charger said it was fully charged. Now what really confuses me is when i jumped the battery from another bike it all powered up and started fine then as soon as i removed the negative jump cable it shut off and was completely dead again then soon as i put the jump cable on the negative post it all came to life again. really has me stumped as i have started to check wires but haven't found any that look fouled and really dont want to just start pointlessly tearing things apart.

Thanx for reading and I'd greatly appretiate any and all help and which direction to start in.