Hi Lurch thanks for your reply.
I only have the seats with out any control gear. can I get away with just a couple of on/off switches even if we have to manually turn them off when they feel warm enuogh, or should I be trying to get controls from a scrape yard.
Can you give me a brief discription of how the circuit works please.
What ever you reply I will be accepting your help, thanks for your time.