86glna

Okay so when I start my car nothing works but the engine runs, when I rev it past 3k the gauges and lights will kick on. When it doesn't work nothing does though. No turn signal or pop up lights. I recently took the dashboard and clusters out and reinstalled them but I can't figure out why I have to rev it to get the electrics going. The volt meter is a bit twitchy and I has a new alternator but still wants to die after a few drives like the battery is dying, when I shut lights and **** off I can drive it slow though. Please enlighten me! All fuses seem fine. It's the 1986 na gl or gll model not sure wich