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General Bobcat Skidsteer Forum
853 starter clicking
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<blockquote data-quote="Jyuma1" data-source="post: 122726" data-attributes="member: 22244"><p>The starter circuit, reduced to its simplest form, is just the battery connected to the starter motor. </p><p>Let's assume (for simplicity) that it takes 100 amps for the starter motor to crank the engine. In that circuit the wire would need to have about .1 of an ohm resistance (that's one tenth of one ohm, which is very low resistance).</p><p></p><p>Let's add in some auxiliary components to that simplified circuit, which are the starter solenoid and possibly a battery disconnect, if you have one. Either of those 2 components add resistance to the circuit, but there is a third auxiliary component in that circuit that we sometimes overlook... the wire that connects the battery to the starter motor. Don't bother looking for high resistance on thin wires, they will not be the cause of your problem. The problem will be related to the thick wires. </p><p></p><p>The click you hear is most likely the starter solenoid attempting to connect the battery supply to the starter motor. The solenoid requires comparativly little current to operate so any "high" resistance in the circuit will not stop it from engaging the battery but once engaged, the total resistance of the circuit is too high to allow high current to flow. There are several component failures that can cause the resistance to be too high and you've already replaced the usual suspects. </p><p></p><p>That leaves us with the thick wires or the battery itself as the culprit. I have seen the factory crimp of the battery connectors develop high resistance (it doesn't take much) which prevents the flow of high current to the starter motor. Everything else electric works fine but the starter just won't run..."Click".</p><p></p><p>The most likely cause of the "click" is a high resistance battery connection. Hopefully you have already removed the battery connections and cleaned both the battery studs as well as the inside of the connectors themselves. And let's not forget the battery itself, as it is the only source of power capable of turning the engine over.</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="Jyuma1, post: 122726, member: 22244"] The starter circuit, reduced to its simplest form, is just the battery connected to the starter motor. Let's assume (for simplicity) that it takes 100 amps for the starter motor to crank the engine. In that circuit the wire would need to have about .1 of an ohm resistance (that's one tenth of one ohm, which is very low resistance). Let's add in some auxiliary components to that simplified circuit, which are the starter solenoid and possibly a battery disconnect, if you have one. Either of those 2 components add resistance to the circuit, but there is a third auxiliary component in that circuit that we sometimes overlook... the wire that connects the battery to the starter motor. Don't bother looking for high resistance on thin wires, they will not be the cause of your problem. The problem will be related to the thick wires. The click you hear is most likely the starter solenoid attempting to connect the battery supply to the starter motor. The solenoid requires comparativly little current to operate so any "high" resistance in the circuit will not stop it from engaging the battery but once engaged, the total resistance of the circuit is too high to allow high current to flow. There are several component failures that can cause the resistance to be too high and you've already replaced the usual suspects. That leaves us with the thick wires or the battery itself as the culprit. I have seen the factory crimp of the battery connectors develop high resistance (it doesn't take much) which prevents the flow of high current to the starter motor. Everything else electric works fine but the starter just won't run..."Click". The most likely cause of the "click" is a high resistance battery connection. Hopefully you have already removed the battery connections and cleaned both the battery studs as well as the inside of the connectors themselves. And let's not forget the battery itself, as it is the only source of power capable of turning the engine over. Good luck. [/QUOTE]
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