4 vs 5 terminal relay
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=96924
Printed Date: November 03, 2025 at 8:59 PM
Topic: 4 vs 5 terminal relay
Posted By: peter hogan
Subject: 4 vs 5 terminal relay
Date Posted: September 06, 2007 at 9:32 AM
I am wiring a keyless entry on a G6. I have 2, 4 terminal automotive relays from radio shack. These relays appear to be the same as the 5 terminal in my wiring diagram, except that they do not have a terminal 87a in the center. Will these work in the same manner? The wiring diagram does not make use of the fifth (87a) terminal. A Pontiac G6 uses a single wire to lock and unlock.
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p.hogan
Replies:
Posted By: the12volt
Date Posted: September 06, 2007 at 9:53 AM
Yes. -------------  the12volt • Support the12volt.com
Posted By: KPierson
Date Posted: September 06, 2007 at 2:58 PM
What you have is a NO (normall open) SPST relay. The 5 pin relays are SPDT relays and contain a NC (normally closed) leg in addition to the NO leg. If the 87A isn't needed in your system then you can get by with the SPST you picked up from Radioshack
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Kevin Pierson
Posted By: peter hogan
Date Posted: September 06, 2007 at 3:22 PM
Kevin, Thanks for the info! ------------- p.hogan
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