DIYers Guide How to Test Car Relays with Accuracy and Precision

Swap Method (without a multimeter): In this method, relays of similar ratings can be swapped to determine if the issue is with the relay. Test the relay to make sure it has actually failed. We'll first go over the basics of an electrical relay to help make sense of the tests in this guide. Relay Buddy 12/24 is a quick go / no-go tester for the most common automotive relays. This new version Relay Buddy tests both 12 and 24 volt relays. Test 12 and 24 volt relays · Settable to 4 and 5 pin relay · Uses vehicle battery for power · 3 Diagnostic Trouble Codes - Green Light if the relay is good - Red ... ... automotive relay works and how you can test it using an digital multimeter. This is the easiest way to do it out of the car and the only way ... Making a relay tester is a cool potentially fun project but for troubleshooting it's often quickest to just plug in a known good relay. Take the other lead of wire and connect one end to the battery positive terminal. Connect the opposite end of the wire to pin 86 on the relay. When you touch ... This Is Part 2 of testing and understanding relays. This video will cover testing on the vehicle as it should be done and also bypassing the ... Testing the voltage drop across the switch contacts. You shouldn't drop my then 0.1 volts across the relay. All your voltage should drop across ... Bench Testing: Bench testing involves removing the relay from the vehicle and applying electrical power to its terminals manually. This method ...