How To Test Auto Relays？

Turn on the ignition switch, and then use your ear or stethoscope to listen to the sound of the control relay, or feel the vibration of the relay with your hand. If there is vibration, then the relay is working well, the electrical appliance does not work due to other reasons. Otherwise, the relay is not working properly.

Common failure phenomena of relays include coil burnout, inter-turn short circuit or insulation aging, contact ablation, thermal decay, and inability to adjust the initial operating current.

(3) Try to reduce the contact resistance of the relay contact

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