Thanks heaps guys.

Just a quick question. The reason for the transistor blowing I think was a dodgey diode (broke away in my hand). I have since red up about these transitors bed found if the wires are reversed on the solonoid we could do some damage again.

So just checking the common cables to the coil ( fat cables) should be on the same side as the band in the diode?

Hope u guys understand the question.