Since the starter motor is relatively small, it needs a continuous source of very high current just to be able to produce the energy needed to start a cold engine. Making this happen is the starter solenoid. The starter solenoid is basically a large electronic switch that can handle the hundred of amps of electricity delivered to the starter motor by the battery. As you turn the ignition switch of your Jeep to the start position, the starter solenoid gets activated, thus connecting the starter motor to the vehicles battery.
The starter motor has to overcome a lot of forces just for the engine to start running. Among those forces are: the internal friction in the piston rings; the compression pressure in the cylinders; the energy needed to open and close the valves; and the energy needed to move every other component directly attached to the engine, including the alternator, water pump, oil pump and others. With all of these forces to overcome, it will make you wonder where the small Jeep starter motor gets all the power it gives off.

Gear Reduction High Torque Starters offer nearly 100 percent more torque than stock starters. A heat-sinked and corrosion-proofed solenoid prevents overheating and prevents thermal breakdown. Mean Green Starters are 1/3 smaller in size and weight than stock. The rotating billet aluminum nose cone versions can be rotated in 20? increments to allow for better header clearance & protection from the heat. Provides 35,000 trouble-free torque-filled starts compared to the average of 5000 starts per stock unit. Amperage draw is less than a stock starter. Heavy-duty construction & extreme performance and reliability with a total of 5 sealed ball bearings to keep out water. Stainless steel mainshafts provide direct line engagement No more hot start problems & a 2-year unconditional guarantee.