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The easiest way is to disconnect the power and apply an Ohm meter across the terminals. Depending upon the solenoid and the power source you should read something from a few ohms to a few hundred. This will vary greatly. If you read in the thousands or an open circuit it is probably bad. You also want to measure the resistance from the input wiring to the case. Again the reading will vary greatly. For a single wire solenoid like one found in a car, you should read the same as the coil resistance in the first part. If its an AC solenoid a reading between the two terminals is probably in the hundreds of ohms. When you test from wire 1 to case and wire 2 to case you will either read an open (meg ohms) circuit or an open on one and a short on the other. this is normal.

Last, you can always apply power and see if it moves. You should see and probably hear the center throw move.

Any solenoid is an electrical switch with main terminals to pass current when

operated by the small terminal being given a voltage .

to check if sol is faulty bridge the two main terminals with thick jump lead if the starter works its faulty.

If it still does not work check these with and without operating the key switch.

1.Good Battery voltage across battery terminals

2.Same voltage at starter

1 and 2 should be the same

if 1.2 check out ok you will most likel find the brushes in the starter motor have worn out

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โˆ™ 2012-11-23 18:35:35
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Q: How do you tell your solenoid is bad?
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