So I just jump started someone's car. At first I connected the - (ground) to a piece of his cross member but it didn't work. The guy then says fvck it and connected it straight to the battery and it worked (sparked a bit). My question is what kind of damage could this potentialy cause considering this is a short circuit, right? Also is there a reason why the cross member wasn't a good enough ground?. The connection was good.
