My mariner start but as soon im in gear my dash stops working as well as my windows tail lights and blinkers, cleaned terminals but stiil doing it

I would recommend having your charging system checked for proper operation. It sounds like maybe the alternator or wiring could be a concern. Certainly, hands on testing overall is what is needed, and it could be related to a different area of the vehicle. Based on electrical demand during acceleration and low engine speed times, it sounds like some elements of power are missing and need addressed.