Yesterday my cranking battery was dead so I tried to use jumper cables to jump the motor from the trolling battery (located in the bow). Engine would crank but not start. 60HP 4 stroke, cables are 16 foot heavy gauge automotive. Is that an amp problem caused by the length/size of the jumpers? So I moved the trolling battery to back of the boat and direct to motor connection, no problems, started immediately. Next question- once the motor started I could not disconnect the battery without the motor shutting down. Is this a 4 stroke thing. I don't recall this being an issue from my old two stroke days.