I was wondering if anyone has come across this problem: the starter won't turn when the car is hot. The starter is new, I believe it is all right. I have had the battery checked and it is supposed to be all right too. Under different testing conditions symptoms vary: for instance on a couple of occasions after a long run when the car would not start I would disconnect the spark plug leads and the starter would turn fine. Then I would connect the leads back and the car would start again! Any suggestions would be greatly appreciated!

basicly looking at starter circuit, the fact you get nothing when car is hot tends to point to a wiring break/poor connection.

you mention new starter, was this renewed before or after symptoms. just because its new dont disregard it.

check all battery connections for cleanliness/tightness

check all earth connections/leads, pay particular attention to earth lead coming from battery, and engine block to chassis.

check condition of ignition switch on back of ignition/steering lock, check for any signs of overheating/blacking on this plastic switch.

check your ignition relays...would need to know model/transmission to look up relevent relay locations.

check starter solenoid connections, if possible, check ignition wire is getting a signal when starter isnt turning, if it is then looking at starter/battery/leads problem, if it isnt then looking at sweitch/relay/wiring problem