The starter requires substantially more current (amps) than the little wires and contacts that make up the start button and starter circuit. These small wires power a solenoid (an electro-magnetic switch) when the start button is pressed; which in turn closes a much larger contact that connects the larger battery wires to the starter motor.
You may have a blown fuse or fusible link, bad starter switch button, bad solenoid, broken wire(s) between the starter button and solenoid, poor connections at any of the terminals on these devices or a bad starter motor. Check the these circuits with a volt meter capable of testing 12 VDC or using a test lamp. Start with the one probe of the meter or lamp connected to a good ground or (-) post of the battery. The other probe should see 12 V (+) power on ONE of the starter button wires and on BOTH when the button is pressed. If not, work your way back to a bad connection or cut wire. Next, locate the solenoid. There should be two heavy cables and one or two smaller wires entering. The smaller wire is from the start button. Power 12V + should be on it when the button is pressed. If there are two smaller wires, one is probably ground or (-). If no power, check the wire for damage, etc. by following the wire back to the starter button. Once you have 12 V + starter circuit working into the solenoid, go to the next step.
Next, check the two heavy cables on the solenoid. One should have 12 V + power on it all the time and the other should have power only when the starter button is pressed. If you do not have power on one of the cables all the time, there is a bad connection,etc. between the solenoid and the + battery post. Check fuses, connections, etc. and make repairs. With power on one cable, press the start button A working 12 V starter circuit is required for this to work. If no power on the other heavy cable, the solenoid should probably be replaced. If you do have power out, it it still won't crank - check the cable between the starter and solenoid. Repair or replace as needed. If cable is good, the problem is likely to be the starter itself.
Apr 01, 2014 |