92 Fleetwood Bounder only starts with aux boost

Big thank you to everyone who chinned in and especially those who stuck with this and emailed me continuously through the process for days. Turns out after testing everything relays, solenoids, switches, disconnects and all testing good. Found a starter solenoid under doghouse tucked way up agains the inside rails that for who knows why the previous owner did not have power going from main bat to it, simply had house bat power going to it from aux solenoid. No free cables just hanging or anything. Obviously a cable was removed at some point. Added proper cable and power from chassis bat to starter solenoid and all works as it should. Thank you again and I look forward to passing a long some of the information I learned.