Starter Relay and How do starter relays work?

 Starter Relay

It is a small electrical device that is used in any vehicle ignition system. The starter relay in a vehicle uses an ignition switch current to close the much more powerful starter circuit. The starter relay and solenoid work together to run the starter mechanism in several automotive applications. A  solenoid circuit can be controlled directly by an ignition switch in a small vehicle. In small vehicles, the starter motor does not require a lot of current to run.

How to do Starter Relays Work?

When you switch on the ignition key, a starter relay transmits small electric power to the starter solenoid, while the solenoid pulls a big current straight from the battery. This activates the solenoid, which sends electricity to the starter motor, which spins the flywheel of an engine.

How to check the Starter Relay?

• Before testing, prepare a fully charged battery and a portable jumper. 
• 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. Remove the battery-positive cable from the battery. 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.
• The cable should be followed from the starting solenoid to the starting relay. There are four terminals on the relay. Two smaller wires are used to “turn on” the relay and come from the critical switching circuit. Two larger wires connect from the battery to the starter, carrying the battery voltage. Remove the wires from the starter relay and mark the two smaller wires so that they can be reconnected appropriately. Connect one end of the jumper wire to the chassis ground. Terminal 86 should be connected to the other end.
• Connect a jumper wire to the positive terminal of the battery. Since the connection between the battery and the starter has been cut off, the jumper can be connected for a short time. A digital voltmeter should be used to measure the resistance between terminals 30 and 87. Its resistance should be less than 1 ohm. If the resistance is greater than 1 ohm, the relay does not work. The relay needs to be replaced.

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FAQ

What happens when the starter relay fuse blows?

When a starter relay fuse becomes faulty, it causes your engine to not turn over properly and can even cause the engine a dead battery. Understanding the functionality and common starter relay issues is the best way to ensure your vehicle runs properly.

How do you bypass a starter relay?

 Just remove the relay and find terminal numbers 30 and 87 and jumper together. This bypass is only for an emergency.

What are the two types of starter relays?

There are two types of starter relays: internal starter relays and external starter relays. Internal starter relays are built within a starter motor. The relay is the switch mounted on the outside of the starter motor housing with its own case.