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If you are trying to test your starter solenoid here is one way you can test it:

Get a 12V test light from any auto parts store.

With all these steps you will need to have someone seated on the mower, have the deck arm all the way in the up position and the clutch pedal all the way down. This should make all the safety switches activate and the solenoid should be working.

1) Hook up the clip end to the "-" or Neg side of the battery, then touch the pointed end to the big post of the solenoid which has the battery cable from the battery. It should light up the test light. If it doesn't then you have a bad battery cable or a bad battery. If it does light up go to #2.

2) With the clipped end on the Neg battery post, touch the pointed end to the other big post on the solenoid that has the cable going to the starter. While holding the test light on this post try to crank over the engine. If the test light lights up the solenoid is fine. You either have a bad cable to the starter, a bad starter or a bad ground in your system. If it does not light up go to #3.

3) With the clipped end on the Neg battery post touch the small post of the solenoid. While holding the test light on this post try to crank over the engine. If the test light lights up then the ignition wiring to the solenoid is fine. If the solenoid has only one small post and the test light lights up here and not on the big post to the start then you have a bad solenoid. If it does not light up then you have a wiring problem other than the solenoid. It could be an ignition switch or a safety switch. If your solenoid has two small posts then one of them is a grounding post and we need to make sure you are getting a ground to activate the solenoid. If this is the issues go to #4

4) Hook the clipped end of your test light to the "+" or POS side of your battery and touch the pointed end of the test light to the second post and see if it lights up. If it doesn't then you have a wiring or safety switch issue.

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Q: Test Solenoid for mtd 18hp brigg and stratton motor?
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