4 prong relay

I have read through this site and a bit on this forum. Really pressed for time or I would spend more time looking. I am adding a lock actuator for something other than its intended purpose. I have printed off the three diagrams and followed it but your diagram shows a terminal "87a" which my relays do not have. I have already cut in the pig tails and soldered the wires needed for the basic install but I am not getting the lock to function.

Will a 4 prong not work for this application? If so where do I look or better yet how do I look this up on this website! Thanks for any help offered

I am doing custom work on a Jeep with aftermarket everything. Nothing standard about any of it. I was notified to give the year, make and model of my car. But none of that info will help here

I just need to know about the 4 prong relays.

Thanks again

https://www.the12volt.com/relays/relaydiagram49.html

This is one of the diagrams I referenced

For the diagram you referenced https://www.the12volt.com/relays/relaydiagram49.html, four prong relays (SPST) will not work. You need SPDT relays as shown.

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the12volt • Support the12volt.com

What is your application? It is possible that you can modify the setup to still work. Also, it could work if you have two more 4 pin relays. Of course it would probably be easiest to just get the correct parts.

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Kevin Pierson

4 "prong" relays are switchers, you will need changeover relays for lock, window etc. applications hence 5 terminal 87a normally close relays.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Follow Kevin's suggestion, I'm 100% sure that whatever you're attempting has been done at least once before by one of the other posters.
To make my point and I'm sure KP agrees, 5 pin relays are more accessible to buy than 4 pin versions.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Thanks for the replies on this. I did just have some 5 pin and harnesses sent over and used your diagrams accordingly. WORKS LIKE A CHAMP! actuator is not quit strong enough though.


I am using a door lock actuator (via a cable)to open and close an inline valve (heater hose) under the dash with an aftermarket A/C heater combo (supplied by March performance), 89 Jeep Wrangler. This was the most cost effective solution to the clearance issues and the customers demands. He did not want to spend 250-300 on a linear actuator (which I suggested).

But I will swap out this stocker for a much stronger unit in the event it fails (when)lol

Doubt if there's one any stronger for that function unless you use a trunk release solenoid.
Either a linear actuator or a specialised solenoid, but = $$

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

But then a trunk release solenoid snatches rather than pulling smoothly.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Now if you could modify a power window motor.........

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.