A Wire can be part of a battery substitute device such as that found at batsub.com.
The red battery wire goes on the positive + battery terminal no matter which side it is on. The black wire goes on the negative - terminal.
the positive wire that recharges the battery after being drained from the starter
When the ends of a wire are connected to a battery, the battery does not produce magnetic fields in the wire. Instead, it generates an electric current by creating a potential difference that drives electrons through the wire. While the flow of current can create magnetic fields around the wire, the battery itself does not directly produce these fields; they are a result of the electrical current flowing through the wire.
Solder the wire.
The battery ground wire runs from the battery to the engine block.
Disconnecting a wire from a battery would break the circuit. If the battery was powering a bulb, the lamp would go out.
run it and then disconnect the negative wire from the battery if alternator dies its bad.
Are you referring to the battery wire that goes to the starter? If so replace the wire. By disconnecting it and follow wire to the starter and replace. Reconnect battery and your done.
Leaving a wire connected to a battery for too long can create a short circuit, which can lead to overheating, damage to the battery, and potentially a fire hazard. It can also cause the wire to overheat and possibly melt or catch fire. It's important to disconnect the wire from the battery when not in use to prevent these risks.
why would my starter wire burn, going from starter to battery
You would short out the battery. If it was a car battery capable of 300 amps and the wire was big enough, the battery could explode.
Red is usually battery positive.