wirer

noun [专属名词]打电报者；用金属线缠结的工人；以铁丝网捕猎鸟兽者

The first thing to check in the ignition system is whether spark is coming out of the plug wirer then work back from this point.
要在点火系统中检查的第一件事是是否有火花从火花塞出来。