So I've done research and still nothing. My 90 won't fire at all and it isn't the battery. I got 3 different battery's and none have helped I even warrantied one already because I thought the bat was bad. I have no power to the car at all no lights dash ect. But when I take the battery out of the car and place it on the ground for 20 seconds and put it back in the car will get power untill I try to crank it. When I turn the car into acc mode all the lights come on including the cooling fans and radio but when I crank it i loose everything and when I try to crank the car no power. Now the car has a new battery, batt studs, replaced the ignition because the security light once and new starter. My next option will be the batt terminals and its a side post but I'm really stumped I need help

 

 

Ive had a shorted out solenoid wire cause the same issues before. I did a head gasket with the engine in the car and managed to pinch the wire than runs from the dash down to the starter soleniod between the head and block when I put everything back together. Everything was fine when the key was in the acc possition, but when I went to crank it, that wire would short out and Id loose all power. Took me a good few hours to find what was causing it.