I’m out of power

I would START by checking all the easy stuff. Remove both battery terminals. CLEAN them good. Leave them disconnected until you're done with all this. Trace where the negative cable grounds. Remove it and clean it thoroughly. Replace it and make sure it's TIGHT. Follow the positive cable to where it connects to the starter relay. Remove it and clean it good. Replace it and make sure that connection is TIGHT. Look for any other grounds that connect the engine to maybe the firewall or frame rail or fender well. There may be a small ground off the negative battery terminal. Follow where it goes. Remove and clean it. Replace it and make sure it's TIGHT. That's about all I can think of until you get more time with your test light and meter.