Re: Tim's hair was wild was from the shock of electricity.
... with static electricity.
Once you have received a shock, the electricity has passed through you. (Probably not the right description if you are a physicist, but I just mean, the action is past.)
If you have a lot of static, your hair will stand up.
If you are in a lightning storm and your hair starts to stand up, you are in a lot of danger!
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.