1997 TOYOTA TERCEL
1.5L EFI DOHC 4 CLY
246,000 MILES

This starting happening only when I had my A/C on. It did not matter how fast or slow I was driving. It would just completely shut off. NO POWER at all!! I would try to start it and nothing would happen. Will not Crank. No Power, No Lights Nothing. Then after about 5-10 min it will just start. Last night while on the freeway going 70mph , I had the stereo on, it just died. The headlights went out, the inside lights the engine was dead. Then it started back up instantly.
HELP....what could it be

I would start by making sure all of the main power and ground connections are cleaned and tightened. Not just at the battery terminals but also the other ends of the cables both the large (starter and main ground) and small trailing wires to the under hood fuse panel.

Dan

Canadian "EH"

Thank you,I will try that