My 93 SC300 is having start up issues lately more and more often.It started a few months ago once in awhile and now 2-3 times a week.At start up the second I turn the ignition ALL the power shuts off and I'd have to disconnect the battery for a sec and it starts up again.I had start up issues in the past but,new contacts in the starter fixed that.This only happens at start up.Any ideas?Maybe new battery terminals loose wire to look at?IDK

Thanks

 

i would check, everything just in case. i know my car does it but it hasnt been started in a long time also the battery is dead.

 

I have the exact same problem. It used to happen often until I brushed off the battery terminals and the battery wire terminals. Apparently some rust and corrosion got in the way? So far it didnt happen again. I dont know why exactly it would start all electronics and then battery gets disconnected when twisting the key, but thats what worked for me for reasons unexplained.