How to Test a Relay Switch

Wherever you find devices or vehicles that are operated by electricity, you will find a relay switch. Used as a safeguard to prevent electrical overloads, these switches open and close when given an electronic signal. It's kind of like a traffic signal for electricity to make sure the current is sent to the right place. But how do you know if your relay switch is working properly? By using a testing meter, you will be able to verify whether your switch is operating efficiently or if it needs replacing.

Things You'll Need

  • Electrical testing meter (2) Fused jumper wires about 2 feet long
Show More

Instructions

  1. How to test a relay switch

    • 1

      Locate the switch that you would like to test. Turn ignition switch on without starting engine and use the test meter to verify the switch in question is receiving power.

    • 2

      Unplug switch relay from electrical harness and locate power and control terminals on switch. Connect larger wires from test meter to the power terminals and smaller wires to the control terminals. Refer to vehicle owner's manual for information on relay terminals.

    • 3

      Check continuity of the power relay terminals with test meter. If the terminals test positive, you need to replace the relay switch.

    • 4

      Check the control terminals by running a fused jumper wire from a control terminal to the positive terminal of your car battery. By connecting your second jumper wire to the remaining control terminal, you should hear a clicking in the relay switch. If no clicking is heard, the relay switch needs to be replaced.

Related Searches

You May Also Like

  • How to Test a Car Relay

    A car relay is a particular kind of remote-control switch. It is magnetically operated and is used to control electrical circuits from...

  • How to Check a Relay Switch

    If you have the feeling that your relay switch isn't working as well as it once did, then you might want to...

  • How to Check if a Relay is Bad

    A relay is an electrically operated switch used to isolate one electrical circuit from another. In its simplest form, a relay consists...

  • How to Test a Four Terminal Relay

    How to Test a Four Terminal Relay. They are everywhere: under the hood and around the vehicle; ... Replace Power Lock Switch;...

  • How to Test Relays

    How to Test Relays. ... How to Test a Relay Switch. Wherever you find devices or vehicles that are operated by electricity,...

  • How Do You Test a 12V Relay?

    A 12 volt relay is an important component in the electrical system of modern cars and trucks. Relays switch the power to...

  • How to Test an Electrical Relay

    How to Test an Electrical Relay. ... How to Test a Relay Switch. Wherever you find devices or vehicles that are operated...

  • How to Troubleshout DC Relay Switches

    Many electrical and electronic devices use relays operated by lower power DC to switch on and off higher power circuits. To easily...

  • How to Test an Electronic Relay

    An electronic relay is a switch that is operated electrically by an electromagnet. Electronic relays control power circuits with low-power signals such...

  • How to Test Starter Relays

    The starter relay and the neutral lockout switch control the starting solenoid. These two components work together to ensure that the starter...

  • How to Test a Fuel Pump Relay

    The only difference between a relay and a light switch is that the relay gets its motivation from an electromagnet instead of...

  • How to Test a Car Relay

    How to Test a Car Relay. Part of the series: Auto Repair & Mechanics. ... What Is a Car Relay Switch? How...

  • How to Test a Key Switch

    How to Test an Ignition Switch. ... How to Test a Relay Switch. Wherever you find devices or vehicles that are operated...

  • How to Check a Fuel Pump Relay Switch

    If you are having trouble with the fuel system in your vehicle and you suspect the fuel pump relay, here is an...

  • How to Test a Switch With an Ohm Meter

    Comments You May Also Like. How to Test a Relay Switch. Wherever you find devices or vehicles that are operated by electricity,...

  • How to Test a Push to Start Motor Relay Switch

    Many electric motors have a push-to-start switch that operates a relay. When you push the button, it completes a connection through the...

  • Bad Starter Relay Symptoms

    A "clicking" sound is the indication of this failure, caused by the contacts attempting to close. ... relay, ignition switch, security system,...

  • What Is a Power Relay?

    Comments You May Also Like. DIY: Electronic DC Relay. Relays are often used in switch-actuated control circuits. When the switch is turned...

  • How to Test a Horn Relay

    One reason a vehicle's horn may not work is a failed horn relay. Testing a vehicle's horn relay is the place to...

Related Ads

Featured
View Mobile Site