Latching Relay

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bmillican

Member - Posts: 1

Joined: June 24, 2019

Location: Illinois, United States

Posted: June 24, 2019 at 11:14 AM / IP Logged

Hey gang, I am needing a latching relay to trigger a fan on an auxiliary trans cooler, I believe that the "Momentary to Constant output" located on this page https://www.the12volt.com/relays/special-relay-applications.asp would be the best option.

I guess I have two questions, 1) Is the diode a standard 1N type? 2) Will that diode keep all current from back feeding into the ground (trigger) circuit?

I intend to use an existing "Tow Mode" button on the vehicle which is a momentary ground trigger sent to the ECM to change transmission shift points. My fear is that when the latching relay is energized/de-energized that current might backflow into the ECM causing issues.

I have attached a basic diagram of how it will be wired.

Latching Relay - Last Post -- posted image.

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: June 25, 2019 at 2:34 AM / IP Logged

A 1N400x diode will work fine. You will need to find a way to break the constant 12v to unlatch- perhaps just a momentary push button switch.

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