02 4r kills when eng warm. no Elect volt

02 4runner starts and when temp start to warm kills. Car is dead.no lites, battery dead. When engine cools, power returns and lites work and engine starts normally. Problem repeats. Replaced battery and alternator. Going Crazy! Help pls

Start by checking/cleaning/tightening both ends of both battery cables.

Battery posts and other connections appear good. As you recall, a bad fuse box connection was found. Power is now restored so vehicle starts.Was having low RPM problems and dimming. With battery power restored, and a few days appears that computer has update its inputs and is running better. Thanks to all for help!