No start by key,but works when jumped.Help!!

crackedback said
Check on both sides of the bulkhead.

If you have a wiring schematic, find where the coil + run and start power wires are located in the bulkhead and probe it there. My Dart has/has a real issue sometimes with this.

Bad connection or the switch may be bad.

Trace it back from the point you know it's live.
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Switched starter relay,got power to coil,under dash I have power running in from bulk.have power to horn that,s it.No power to ign. or lights.I spent a couple hours testing for power coming in at bulk.I,m stumped cause it worked 16 hours before.