Can someone help? I need to drive my dart tomorrow

The weak link is the connections. But the point is if there is a short or another bad connection - that's how a fire is going to get started. Without the ammeter to monitor the current flow, he needs to check these possibilities out before driving it. That ammeter's bat post is no condition to be used as is - and I'm not suggesting he use it tommorrow. In fact I'm suggesting he may not want to use the other one either. Depends on whether it is insulated from ground.