PAL Jr documentation or software?

[PlatformerZ]

I'm envious  Always wanted a PAL JR back in the day. We ended up ordering a RamBOard which actually got lost in the mail so that didn't happen either. 

There are some information links: http://amiga.resource.cx/search.pl?product=PAL+jr

                                                  https://bigbookofamigahardware.com/bboah/product.aspx?id=1361

I haven't found any references to driver disks or a manual but if it's not autobooting then you would need a Kickwork or Workbench disks with a mountlist entry for the HDD and assigns for the ram I'd guess. 

[PlatformerZ]

Without Autobooting, the Amiga probably doesn't know there's a HDD there at all. You need a SYS:Devs Mountlist entry stating the device specs which is invoked in the SYS:s/startup-sequence at boot.

If you visually inspect the PAL jr pcb's and try re-seating any IC's on the PAL jr itself, ram card and SCSI card you might overcome any loose contacts that have developed over time on the cards which could be causing the boot issue. (?).

AFAIK Kickstart 1.2 won't autodetect expansion ram other than the 256k front unit. Something like Addram or AddFastmem is needed. Not sure what the actual command is. Kickstart 1.3 may be capable of it though.