The three most hated letters T P S !!!!

[coeurdelion]

Morning,hope everyone is well,I got my 2000 yamaha fazer 600 very wet whilst out and the day after whilst riding I noticed the revs dropping from 5000 to 0 then back up to 5000,i replaced a dodgy double headlight conversion wiring with a proper plug thinking thatveas the cause but no luck,I did the unplug and plug in tps technique and it went to 10000 and will not adjust down to the usual 5000,the bike is fine on tickover and runs normal with no surging or flat spots,with the ignition on and the tps unplugged the revs jump 0 to 3000 then 0 and 3000 repeating  ,I bought a new tps and it had the bike still had same symptoms ,I bench  tested the new tps with a meter ,no reading between the outside two pins but either one of the outside and the center pin I got a reading of 5.9 but this didn't alter when I turned the tps as if it was the throttle twisting ,my old tps had no readings at all,basically was the new tps dodgy or am I looking at another problem that isn't tps related?,apologies for the long thread 
Cheers coeurdelion