Which relay?

[rumrumm]

I need to order a relay for my electric fan. Do I need one with a diode or not? Too many choices here:

https://www.delcity.net/store/NC/NO-Change-Over-Relays/p_931728.h_931744

[WZ JUNK]

I need to order a relay for my electric fan. Do I need one with a diode or not? Too many choices here:

https://www.delcity.net/store/NC/NO-Change-Over-Relays/p_931728.h_931744

If you have anything that has electronic components, like a circuit board, or something that uses a computer, like computer controlled fuel injection, you need the relay with the diode.  Usually there is not a lot of difference in price, so I would go with the diode.  That way if you add something later, you will already be using the right relay.  The diode prevents a reverse spike when the diode shuts off.

[kb426]

What is the controller used to operate the relay?

[rumrumm]

It's a sensor in the intake manifold.

[WZ JUNK]

I just now reread my early reply.  It should say that they the diode stops a surge or spike from happening when the RELAY shuts off.  Sorry.  

Not only can I not think clearly these days, I also can not type or write clearly.  This is not new news. I will blame it on fat fingers with arthritis.  

[kb426]

Lynn, I use regular relays for items as you described. I'm assuming that your sensor sends 12 volts to the relay actuator coil. I don't think you will go wrong no matter which you choose. I have been buying groups of 6 or 12 on ebay with plugs and pigtails for not much money. I haven't had a failure yet.

[rumrumm]

Thanks, everyone. Appreciate your help.

[Beck]

My trips to the auto recycle yards (formally junk yards) are much more infrequent than they used to be. When I go I try to leave with a pocket full of relays. That must be common because there aren't many cars that haven't had them already pulled.

I don't really care for the pigtails that come with the bought relays. I don't like putting that many joints in the wiring. I prefer to purchase the connectors that have the crimp on ends included. Then I can crimp the ends on my wiring and insert them into the connector. I never use the crimp on butt connectors. They are an invitation for corrosion. At the minimum I solder the wires together and put shrink tube over the joint.

[wayne petty]

AZ Duralast Relay 19349 is less than 15 bucks.. this is a 70A 12 volt relay..

Pin 30 and 87 terminals use 3/8 push on connectors so you can easily use 10 gauge wire

 where the 85 and 86 pins use regular size .250" terminals..

its just a thought..

[WZ JUNK]

AZ Duralast Relay 19349 is less than 15 bucks.. this is a 70A 12 volt relay..

Pin 30 and 87 terminals use 3/8 push on connectors so you can easily use 10 gauge wire

 where the 85 and 86 pins use regular size .250" terminals..

its just a thought..

It is good to hear from you.

[wayne petty]

It is good to hear from you.

Just been hiding out..  not doing anything.. other than watching youtube..