Check starter wires that loosened up and are contacting. Sticking solenoid.
1. To engage the starter with the ring-gear on the engine before the starter is turned on. IE to "pre-engage" it. 2. To turn the starter on once it is Engaged. This prevents/reduces damage to the gear-teeth on both the starter and the ring gear.
Besides the smart alec answer "start an automobile", a starter has a small gear, that will both extend as well as rotate when the key is turned. This gear will engage teeth on the flywheel/flexplate, which is bolted to the rear of the crankshaft. As the starter turns, the engine will be turned.
If there is complete silence when the key is turned, try tapping the solenoid on the starter with a hammer. Don't laugh. I have found this to be the solution in several cases. This is sure proof that the starter solenoid is the problem. You will want to install a new starter which comes with a new solenoid before you get stranded.
If you mean the relay that controls the starter motor then it is fairly simple. There are 2 possible faults. 1) The relay is working, but is broken or burned out internally. You will hear a click from the engine bay when the key is turned but the starter motor will not do anything, not even engage. 2) The relay is broken. In this case nothing at all will happen when the key is turned.
If the starter will not engage on a 1994 Geo Tracker, it is possible that the solenoid needs to be replaced. There could also be a loose wire on the starter solenoid. Also check that the battery is fully charged. The battery could have gone dead while it was being driven.
IS THE VEHICLE IN PARK? IS YOUR FOOT ON THE BRAKE? Then it might be the neutral safety switch located on the side of the transmission. It's a fairly inexpensive part/repair.
You get a 12volt test light and put the clamp end on the frame where there is no paint Then you put the needle end on the bigger bolt .With the key turned on one side of the solenoid should have power. Then put the tester on the other side and push button to engage the starter it should light the tester lite if it does not lite up then your solenoid is probably bad.
Then why did you replace a perfectly good starter? ALWAYS test old parts and know what you're doing BEFORE you start throwing new parts at a problem. Find out WHY it isn't starting. Does the starter engage and turn the engine? IF it does, then the starter is probably fine. If not, check the starter, battery, electrical connections, ignition switch and neutral safety switch. If the starter has ALWAYS engaged and turned the engine, you should not have changed the starter in the first place; instead, you should be finding out what's wrong.
Rotors are out of round,need to have them turned.
On my 03 Chevy Silverado I just added brake fluid and the message turned off.
A 1986 Ford F150 starter won't stuff off when the key is turned off if the ignition switch is jammed. This will cause the start signal to be sent to the starter continuously.
Possibly, but it can also be a loose connection, mis-aligned or failed neutral lockout switch, faulty ignition switch or a bunch of OTHER potential problems. Isolate and thoroughly diagnose the situation first. Don't just throw parts at the problem.