Question When I try to start the car it will continue cranking even if I turn the switch off. If the starter and solenoid are OK what would you recommend checking. Thanks Joe
AnswerThe starter cannot crank unless the electrical contacts in the solenoid are closed, so the problem is almost certainly in the solenoid. Usually, when this happens, if you pull a battery cable to stop the cranking, then re-connect it, it will be OK until the next time you try to start it.
It is remotely possible that your starter switch is not turning off when you turn it off - to check for this, leave the wire from the switch to the solenoid loose, and the next time this happens, pull the wire loose - if it quits cranking immediately, you DO have a switch problem. If it keeps going, it's a solenoid problem.
If the problem is that the solenoid is staying "ON" even with the switch off - you can take it apart to see why it is sticking. The solenoid plunger may be sticking due to lack of lubrication or some debris, or it may be a broken or weak retractor spring, or there may be a mechanical problem in the pinion or main shaft of the starter, keeping the drive gear from jumping back when the engine fires.
If you want help with it, a good starter rebuilding place should be able to fix it for you - take both items to the shop and let them figure it out!
Dick
