Starter/Solenoid Woes

[The_Storme]

OK Here it goes, it is a 1982 Ram B250 Conversion. Had been having intermittant Solenoid problems. Then Parked it , hours later, no solenoid toss out / no starter engage, just Starter stutter. Replaced Starter (Dummy Me, forgot to disconnect battery) installed engaged 1 x good , low on power, setup to jumper cables. No Engage. replace battery relay, & starter Relay.

Now no activity at starter , Nuthin. Good power to headlights, good spark when bypassing ignition on starter. no engage. BTW old starter did fail solenoid, and new tested good, before I left the store.

What could be causing this? and how to test it before replacing any more parts ??
T Y I A, The_Storme

[alloro]

The neutral safety switch down on the tranny could be worn and making intermittent contact.