intermittent starter or ignition issue?, where to look next? Options

[DRPHIL914]

So this issue has happened 3x now in the past few months, and now today after driving 300 miles up to Brevard, NC on the way , stopped to get gas, going to start it, no crank. all other electronics work, fuel pump priming just no starter engagement. it’s happened cold too, i can get it to start by push start.. so about an hour ago i pulled the steering wheel and replaced the plastic switch still no starter , i also checked the yellow wires under passenger seat (seat buzzer by-pass) , i don’t think that’s the issue.

I bought and installed a new Bosch starter about 6 months ago and installed it on this newer motor a few months back, so now i am wondering if it’s a bad solenoid? wond not crank . the last time it happened was a months ago, push start got me home from the store, and when i got home and pulled into the garage after turning it off it started right back up and has for the next 10 times —- until tonight.

what are the other possibilities? does the power go from the ignition switch to the relay board and then to the starter? i have done a few searches , but looking for someone that’s maybe had this issue or understands the whole schematic better . i don’t have a multimeter with me but i can get one tomorrow at O’Reilly’s and i might see if they can get a starter., i’m just guessing and grasping at straws ..

- oh, for those that don’t know it’s a ‘75 2056 d-jet.

Phil