80LS1T Posted July 3, 2005 Share Posted July 3, 2005 I have been looking at wiring diagrams for the past few hour while doing some wiring in my car and I was having some trouble findin the pin outs for a relay that I am going to use. I am using a relay box/fuse box out of some kind of Dodge product(not sure on what kind of vehicle because I got it out of a pile of old wiring harnesses from work). Now it has 2 spots for your normal square relay and 2 spots for those smaller relays(I think they are called micro relays?). Well I think I found the info I need on the pin outs but I have one question that I just cant seem to answer by myself.... What is pin #87A for? It seems like it goes to nothing in all the wiring diagrams that I have but why put it there if it just goes to nothing? Do I need to hook it up to something? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
80LS1T Posted July 3, 2005 Author Share Posted July 3, 2005 Ok I think I may have answered my own question... After staring at some more diagrams, I think that the reason there are two 87 pins(87 & 87A) is because 87 is set up for a circuit that is normally open(the contact rest on 87A) and 87A is set up for a circuit that is normally closed and when the cicuit/relay is energized it opens the contact. That's my theory but is it right? Guy Quote Link to comment Share on other sites More sharing options...
jimzdat Posted July 4, 2005 Share Posted July 4, 2005 If it helps--yes, you did answer your own question; one is NO, the other is NC. Be careful when buying replacement relays as well--some of the ones they sell for lighting setups appear the same (have all 5 terminals), but there are really just 2 87 pins, no 87A Quote Link to comment Share on other sites More sharing options...
2003z Posted July 4, 2005 Share Posted July 4, 2005 I don't know what NC is, but 87a is energized when the power source is not present. Quote Link to comment Share on other sites More sharing options...
Dave Posted July 4, 2005 Share Posted July 4, 2005 I don't know what NC is, but 87a is energized when the power source is not present. NC is normally closed NO is normally open Quote Link to comment Share on other sites More sharing options...
80LS1T Posted July 4, 2005 Author Share Posted July 4, 2005 Well thanks for conferming my theory. I went ahead anyways today and wired up the relays that I needed to and didnt use the 87A for anything. I was pretty sure I was right and Im glad I was because I am getting a little burnt out on wiring. Although I should be about 95% finished by tomorrow afternoon with wiring up my new engine harness! Guy Quote Link to comment Share on other sites More sharing options...
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