Hi, i've got a mondeo zetec yr 2000, bloody thing wont start, when i turn the key I hear a clicking noise, occasionally the engine starts to turn over but then stops and then the clicking comes back. After reading forums I've found out i need to check the battery and that's fine, also I replaced the starter motor with a brand new one so that's fine, I don't have any other ideas and the whole reason i replaced the starter motor myself is cos i don't want to pay garage costs, if anyone could help with any ideas on what could be wrong now its be appreciated?

Simon