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20hp Johnson push-button 'start' won't crank the starter ...
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<blockquote data-quote="rabbit" data-source="post: 383481" data-attributes="member: 10250"><p>All a solenoid is is a coil of wire that is an electromagnet. Juice goes in one side of the coil and comes out the other side. These are the small wires. The electromagnet moves a piece of steel into the large stud contacts which switch your starter.</p><p> If you take a pair of old pliers and short the two large contact nuts together the motor should crank. It will probably arc and put a mark on the nuts on the studs but don't worry about it. Gear heads have been doing this since forever.</p><p> The little wires/contacts/studs should have good continuity between them. Almost zero ohms, maybe .2 or something. If it reads infinity it's toast. If you apply voltage to the electromagnet you should hear it click. At this time you should have almost zero ohms between the large terminals. Remove the large wires before you check this.</p><p> If you jump a large cable (jumper) between battery + and the stud on the motor, it should crank. Touch it to the nut of the stud. I have on occasion taken the starter off the motor, clamped a cable between the starter flange and battery negative, clamp a cable to battery positive and touch it to the stud on the starter. Hold onto it good because it should spin. If it doesn't the starter is broke. Then you have to take it apart.</p><p> FYI: Sometimes you can find compatible brushes at the auto store. In a pinch oversize brushes can be sanded down to fit. </p><p> Cheers</p></blockquote><p></p>
[QUOTE="rabbit, post: 383481, member: 10250"] All a solenoid is is a coil of wire that is an electromagnet. Juice goes in one side of the coil and comes out the other side. These are the small wires. The electromagnet moves a piece of steel into the large stud contacts which switch your starter. If you take a pair of old pliers and short the two large contact nuts together the motor should crank. It will probably arc and put a mark on the nuts on the studs but don't worry about it. Gear heads have been doing this since forever. The little wires/contacts/studs should have good continuity between them. Almost zero ohms, maybe .2 or something. If it reads infinity it's toast. If you apply voltage to the electromagnet you should hear it click. At this time you should have almost zero ohms between the large terminals. Remove the large wires before you check this. If you jump a large cable (jumper) between battery + and the stud on the motor, it should crank. Touch it to the nut of the stud. I have on occasion taken the starter off the motor, clamped a cable between the starter flange and battery negative, clamp a cable to battery positive and touch it to the stud on the starter. Hold onto it good because it should spin. If it doesn't the starter is broke. Then you have to take it apart. FYI: Sometimes you can find compatible brushes at the auto store. In a pinch oversize brushes can be sanded down to fit. Cheers [/QUOTE]
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20hp Johnson push-button 'start' won't crank the starter ...
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