I took the old crappy alarm outta my fourtrak 2.8TD today, i did it very carefully and luckily the wires had only been taped on and not soldered. However i came to start it and it just wont start. Glowplugs heat up, timer relay clicks but no ignition. The alarm has been disabled since i got it, so i donty understand what could stop it starting. Anyone got any ideas for checking whats stopping it starting?