If a jumper wire is used to connect points A and B, what will happen?

When a jumper wire connects points A and B, the outcome largely depends on the nature of those points and their relationship in the circuit. If points A and B are at the same potential or effectively do not influence the circuit's overall behavior, then the result of connecting them with a jumper wire would be that nothing significant occurs. In this scenario, the circuit remains unchanged, and current flows as it normally would without any disruptive effects.

This outcome is plausible if both points are connected to the same electrical node or have no load between them, meaning the circuit is stable and the connection does not create any new paths for current. In contrast, if the jumper creates a low-resistance path that bypasses critical components, it could lead to a short circuit, battery drain, or even unexpectedly starting the vehicle, depending on the specific circuit configuration involved.