If the relay of the car is broken, it will have the following conditions: 1. The starting line is faulty, the starting line has a break, poor contact or loose wire. 2. Power failure, battery power shortage or plate vulcanization short circuit, start power lead connection poor contact, etc. 3. Starter failure, bad contact between commutator and brush, bad contact between contact plate and electromagnetic switch contact, local short circuit between motor excitation winding or armature winding, etc. A relay is a circuit that can control a large amount of power with a small amount of current, and can also extend the range of control. When the signal reaches a certain value, according to the different forms of the contact group, switch, disconnect and connect multiple circuits at the same time, so as to achieve the purpose of automatic switching.

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