starter is on drivers side of engine. you will need to tilt cab -[make sure out of gear and h/brake on] using test light or meter ,locate small wire on starter solenoid usually held in with small screw ,put one end of test light to this and the other end to a good known earth,when key is turned to start position lamp should light -if so then your problem is starter motor-if not then wiring/relay or ign switch is at fault.DONT FORGET THAT LARGE LEAD ON STARTER MOTOR SOLENOID IS LIVE!also make sure that all wires are intact on alternator broken one could be affecting starter circuit.
k, May 2009