Newbe need some relay

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: February 20, 2018 at 11:34 AM / IP Logged

You will not need the diode in line with the ecu and the relay. You should still put the diode across 85 and 86.

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: February 20, 2018 at 8:52 PM / IP Logged

wirewise wrote:

A 1N4001/L diode across the coil of your SPDT relay should be fine. https://www.the12volt.com/diodes/diodes.asp

Standard rectifiers like the 1N4001 are too slow to properly suppress back emf from the relay coil. A high-speed rectifier (Schottky) like 1N5819 is required. The rectifier needs to be rated for at least 3X the coil voltage and with a current rating at least equal to the coil current.

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: February 21, 2018 at 8:25 AM / IP Logged

To protect against the back emf from the relay coil you will need a diode that switches faster than the 1N4001 as the peak amplitude of the voltage spike occurs in the first few microseconds after the coil is de-energized. A Schottky diode like the 1N5819 would be a good choice.

Whoops sorry about the double post. I don't know how to delete it.

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