Thanks Dan,

I did exactly that, I removed all connections and started with the rectifier, all good there! connected the solenoid board and checked the voltages and all came up ok there so I plugged it all back in and Bingo!!
I reckon it was the connections from the rectifier, they were quite fresh meaning they had been repinned recently by a previous owner so they are in good condition but after removing them and then connecting again seemed to do it. I must say I have learned a lot from this exercise and at the very least performed some preventative maintenance, especially with a new mpu board, capacitors on the solenoid board and the repinning all the connectors. That Molex Crimper I borrowed from Nigel was a gem! It's the ratchet type and basically fool proof, made easy work of a tedious job.

Thanks so much for your advice, if you are ever up the northern end you must stop by for a game of retro pinball!

Cheers: Brettski... :)