How to tell common wire

Shai Amiel
更新时间 2021-04-30 15:27:16 UTC
话题: 安装
Hello

I had dc solonoids so Im redoing the whole system. 
I boyght bermad 24vac solonoids, they have 2 wires but both are red - how do I tell which one is connected to the common spark plug.

Shai
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