Discussion
Which precaution protects an alternator during welding on a vehicle?
Answer: A
Welding currents and induced voltages destroy diodes and regulators, so the battery is disconnected and the earth clamp placed close to the work. Earthing through the alternator is exactly what must be avoided, which is why that option is a trap. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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