The lanyard kill switch is on the bottom of the throttle control. To my knowledge they because required before the Maxum line was started.
Is the ground wire from the battery to engine block clean and tight on the block?
It's rare but new battery's can be bad, yes you can jump with another battery.
Another potential issue could be a locked engine, when did it last run?
1997 2400 SCR
5.7 Vortec / Bravo 2