2012 GEM e2 dead dash

Bought used. Ran when parked, batts/ cables corroded. Installed new batts and all new cables complete to the dash. Dash is dead. Checked all fuses and checked voltage, all good. What to check next? I ordered a manual and am waiting for it. Any help is appreciated.

Try not to double post.
It confuses the he!! out of people. (mainly me)

Sorry, first post and it took a bit for it to be approved