Watch the battery voltage right at the terminals while turning the key. If it really drops you probably killed the battery.
If the battery voltage doesn't drop, turn on the headlights to see if they work. If they don't, measure voltages till you find where the loss is. Check -ve and +ve voltages.
Peter
If the battery voltage doesn't drop, turn on the headlights to see if they work. If they don't, measure voltages till you find where the loss is. Check -ve and +ve voltages.
Peter