1993 Ply. Grand Voy.

The gauges, Spedo, Inter. Lights, Gauges lights, Dummie lights, wiper delay all are not working. Think theres a bad ground but can't find a diogram for this van in manual. It's a 93, with a 3.3 eng. 229,494 is the mileage. When this first started, they would go off and then jump back on. Now they don't even do that. Also since this happened the back hatch won't upon unless you turn the van off. Any idea's.