Teach you how to test a damaged relay

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(Last Updated On: October 12, 2022)

Step 1

When working under the hood, you don’t want the vehicle to move forward accidentally.

Step 2

Before testing, prepare a fully charged battery and a portable jumper.During the whole test, please pay attention to how to connect the jumper cable to the battery terminal.

Step 3

Check the connection terminals on the battery and starter. Make sure they are free of rust, oil, dust and debris. Before cleaning corroded terminals, disconnect the negative battery cable and set it aside. Remove the battery positive cable from the battery and set it aside. Take care to prevent the cables from accidentally contacting the battery terminals. Use baking soda, water and a wire brush to clean the rusty terminals. If necessary, clean the starter terminal. If possible, disconnect the battery cable.

Step 4

There are four terminals on the relay.Two larger wires connect from the battery to the starter, carrying the battery voltage.Connect one end of the jumper wire to the chassis ground.

Step 5

Connect a jumper wire to the positive terminal of the battery.Its resistance should be less than 1 ohm. If the resistance is greater than 1 ohm, the relay does not work.

How to replace the starting relay?

1) How to disassemble the starting relay correctly?

You can open the hood and disconnect the negative connection of the battery if it is a fuse box to start the relay. Next find the fuse box. Usually a box with a black lid. If you cannot find the starting relay, please use the instructions. Determine the position of the starting relay according to the information on the fuse box cover. Then, remove the starting relay.

2) How to install the starting relay

The process of installing the fuse box starter relay is simple. There are no nuts or screws to tighten, and no need to worry about torque.

Bring your new relay. Push the relay in slowly and slowly until it reaches the end of the valve seat, matching the pins with the slots in the fuse box.

Follow the steps below to install the start relay on the mudguard.

Place the relay on the mounting surface and fix it there. By inserting and tightening the screws, attach the relay to the fender wall. Install the starter circuit and battery wires, taking care not to connect the wrong wires to the wrong poles.

3) Wiring of starting relay


Disconnect the positive terminal of the battery. To avoid accidents, please fix the bare end. You can do it with tape.

Step 2

Connect it to a large stud or upright of the relay. Tighten the mounting bolts to secure the connection. Because the starter relay has no polarity, which large one do you connect the wire to

Step 3

Prepare ignition switch wiring. They are usually thinner than starting cables because they only carry a limited amount of current.

In some relay races there is only one small post. If this is the case, connect the ignition wire to the mounting screw or bolt.


Connect the remaining thick wires to a single huge stud or pole. This is the cable connecting the positive terminal of the battery.

Finally, turn on the ignition switch to test the relay wire. There should be no difficulty in starting the engine and cranking.

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