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Re: DC relays .Purpose of the diode
Posted to Technical Theory Forum on 8/5/2018 8 Replies

The collapse of this coil when the 12v is turned off , the collapse of this field can spike to 50v . You don't want this spike going back to the pcm . This is why you install the diode to keep this spike from going to the pcm and directing it to the - side of ... Login to read more.

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