Yesterday I had my battery tray out to cut off those metal tabs on the bars that come down and to remove the little metal hold down so I can fit a slightly larger size battery. She worked fine after this, later that night I discovered the heater blower wouldn't turn on, no big deal, I ignored that figuring it was a fuse.
Today I try to start it, the buzzer works, I hear the solenoid click but the start does not even try to turn over. So, I checked the voltage at the battery, its fine. I check fuses, they are all fine. So after some searching around online I tried crossing the starter's power over while the key was held on and she fired right up. Now the ignition seems to work fine. (I'm keeping tools in the jeep just in case.)
My question is, what could cause the starter to not power up but suddenly start working again after crossing the starter over?