1, The function of starter relay
There are many mechanical components responsible for controlling automotive circuits. Below, we will focus on the starter relay. The main function of the starter relay is to provide the required high voltage and current to the starter, thereby smoothly starting the engine. The starter relays on the market are mainly divided into two types: direct and indirect. There are also two corresponding wiring methods for it. The direct relay directly connects the power line to the starter, while the indirect relay first connects the power line to the relay and then outputs current from the relay to the starter.
2, Wiring method of starter relay
Direct starter relay wiring
The wiring process of a direct starter relay is relatively simple because it is directly connected to the starter. The specific steps are as follows:
Connect the positive pole of the power supply to the positive pole of the starter motor. In old cars, this usually means connecting the positive pole of the power supply to the electric charcoal part of the starter.
Connect the negative terminal of the power supply to the rectifier or engine body of the engine.
Ensure that the ground wire of the starter is connected to the grounding system of the vehicle body.
Indirect starter relay wiring
The wiring of indirect starter relay is slightly more complicated. The wiring diagram of 12v starter relay is as follows:
Connect the power cord to the "B terminal" (also known as the "30 terminal") of the relay.
Connect the 'S terminal' to the 'start signal' output terminal of the ignition switch.
Connect the "M terminal" (also known as the "87 terminal") of the relay to the "S terminal" of the starter.
Connect the "E terminal" (also known as the "87a terminal") of the relay to the "M terminal" of the starter.
Ensure that the "G terminal" of the relay is connected to the grounding system of the vehicle body.
3, Precautions
When wiring the starter relay, the following points should be noted:
Strictly follow the correct wiring sequence in the manual to avoid damage to the car circuit or even starter failure caused by incorrect wiring methods.
Before performing any wiring operations, make sure the power is turned off to eliminate the risk of electric shock.
Finally, it is necessary to select and use relays that meet the specifications to ensure that the starter can work properly. If low-quality or incompatible relays are used, it will affect the safety of equipment use. QIANJI is a supplier of high-quality starter relays that can provide you with suitable relay solutions.
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