Hi DaveTrack the voltage back from the relay coil through the Zeners and resistors to see what the voltage is , maybe one the Zeners is breaking down. Use my drawing in post #21.
Firstly :Thanks for your reply, will do that check, just a quicky is the last drawing I posted " A better Drawing ! " on the right track or is there still something not correct ! .
Secondly: which points are the feed into Relay coil , I have numbered 1 to 4 in blue circles what I thought was the Relay contacts ! .
Spike