When it came to toys based on Ghostbusters II Kenner didn’t fully capitalize on the potential opportunities. Even with a The Real Ghostbusters episode, Partners In Slime which has the most Ghostbusters II influence.
Kenner marketed the Ecto-Charger Pack as the official one The Real Ghostbusters wear. Unless the characters in the series were suppose to wear them and at some point that changed over at Columbia Pictures Television/DIC Entertainment they never wore Ecto-Charger Packs. Maybe that’s the reason a Ghostbusters II decal was included.
I’ve taken the original 4 page Ecto-Charger Pack Instructions, scanned them, and made them into 3 PNG files. I’ve also scanned and included the decal sheet.