Previous assistance appreciated and thanks to all who assisted. Thought I had starting issue on my B8200 sorted but but but !!! Previously all terminals at rear of ignition switch tested ok with test light. and tractor was starting ok. Now the terminal that connects to dash mounted pre ignition coil has no power whereas other terminals test ok. Neither is there power to glow plug when I connect test light to it. Have power to dash lights. What should I be looking for?