Reverse Polarity: If the jumper cables are connected with incorrect polarity (i.e., positive to negative and negative to positive), it can cause a high reverse current flow through the alternator diodes. It can lead to diode failure and permanent alternator damage.
High Voltage Surges: When the jump-starting vehicle's engine is revved to increase the voltage output, it might create voltage spikes or surges. If the alternator diodes are subjected to these excessive voltage transients, they can become stressed or damaged.
Prolonged Jump-Starting: If the discharged battery in the recipient car is heavily depleted, it might require an extended period of jump-starting. Continuous high current draw during prolonged jump-starting puts stress on the alternator's electrical components, including the diodes, and can lead to premature failure.
Faulty Jump-Starting: If there are faulty connections, loose contacts, or improper grounding during jump-starting, it can lead to sparks or voltage spikes that might harm the alternator diodes and other components.
Although properly done jump-starting doesn't usually harm the alternator diodes, following proper procedures and avoiding these potential pitfalls can help ensure a safe and damage-free jump-starting process.
