87 Chrysler fifth ave doesn’t turn over no spark.

Alright guys I'm having trouble fi finf the problem with my brother fifth avenue. It was running and driving fine until o e day he went out to start and nothing happened. Turn the key and nothing happens. I've replaced the starter switch and starter relay and still nothing. It will turn over but not start when you jump the relay. Battery is good and charged. I've checked the neutral switch. Not sure where to look next. Any ideas?
Author: fury1