[Michael C Henry]

By ratcheting you mean clicking repeatedly? that is not enough current available to starter .Could be battery ,ground and hot cable.The ratcheting -clicking, is the solinoid being pulled in magneticly. When the heavey current is switched to roll the motor , the current draw that it takes to rotate the motor will drop the voltage at the magnet and the solinoid opens .breaking the heavey current switch ,again and again.click-click- click-click. It is all a big circle battery- positave cable- starter -ground- battery. The supply is not enough for the demand.