Delay relay - Arching when engine is running, Why? (1 Viewer)

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Nov 20, 2020
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I wired a delay relay to the relay that connect my starter battery with my aux battery
When the relay has power, the green LED is energized. When the delay time lapse, the relay energize and the green LED energize
When I switch on the ignition, the relay seems to operate fine
When I start the engine, it sounds like the relay is arching? See videos in below link. Why will this be?

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