Sunday, June 26, 2011

How to test cars starter?

Starter motor problems usually are indicated by the following symptom: Turn the key to the START position and you hear a loud click, or sometimes you hear nothing. The headlights are bright and don't dim when you turn the key to START, and everything else electrical seems to work fine. It could be a bad starter neutral switch or a bad key switch but about 99% of the time it's a bad starter or starter solenoid. Here is the procedure for checking out a starter motor and its solenoid. To test the starter try this procedure.

--------- Measure the voltage at the starter solenoid. Place the red probe on the positive battery terminal on the starter solenoid and place the negative probe on chassis ground. Have someone turn the key switch to "START" while you measure the voltage. The voltage should be approximately 12.6 volts. If the voltage is correct, there is a problem with the starter. Remove the negative battery post and check the connections on the starter. But if voltage is very low and less then 12 volts, this indicates its faulty solenoid. If you follow the wire from starter solenoid, it will reach the starter relay. That starter relay is a 12 volt part. If there is no voltage to starter or solenoid then its faulty starter relay. ---------------- If starter checked out ok, then its many other possibilities too causing this problem. Touch the end of the red jump lead onto the large terminal of the starter. The pinion should rotate strongly.-------You can diagnose the starter by measuring the current draw. You can purchase a small "clamp on" ammeter that you simply lay on the cable to the starter .In this case you don’t have to disconnect anything. Crank it and watch the little needle tell you what the current is. If there is a high current draw then you know that the starter is at fault. There is one main reason for a starter to fail when it is hot - worn bearings, especially in the tail shaft. The heat generated in the starter by the engine and the exhaust pipes (sometimes) causes the armature to expand. If the bearings are worn then the armature drags (actually contacts) on the stator causing a short circuit and a high friction drag. Sometimes just replacing the bearings can fix the problem.





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