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Old 06-08-2017, 05:44 PM   #1
Texas001
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Default Determining relay pins

I had a beep beep horn on my cart some years ago but the horn shorted out or something and it took it off, along with the relay. Now I decided to put on another horn (with relay). I tossed the old horn and relay so I am starting over. I bought a three pin replay and lo and behold the pins are not marked. The relay is a Horn Relay Standard HR127T. Since I am about as dumb as a box of rocks when it comes to wiring I need to know the pin numbers or in the case of most three pin relays S (switch) B (battery) H (horn). This relay doesn't have any markings and so I am stuck. Does anyone know how to determine pin names or numbers (30, 85, 86 ) by using a multimeter? I am afraid to do trial and error and blow the relay. Wish I would have kept the old relay that had the pins marked. Thanks, remember make is simple if you can.
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Old 06-08-2017, 06:14 PM   #2
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Default Re: Determining relay pins

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Old 06-09-2017, 05:26 AM   #3
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Default Re: Determining relay pins

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Originally Posted by crash test dummy View Post
Thanks for your reply but the diagram assumes that the pins are marked. I can wire with marked pins. I need to know how to determine which pins are which. Once I get the 30 pin or B pin I think that you can go either way on the connection to the horn side and the switch/ground. BUT I have to know which is Battery (30) as a starting point.
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Old 06-09-2017, 05:50 AM   #4
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Default Re: Determining relay pins

are they marked ?

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Old 06-09-2017, 06:01 AM   #5
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Default Re: Determining relay pins

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are they marked ?

No markings at all. That is the problem. I sent an email to the seller and of course he never replied, just sent me the relay. I think I will just have to toss it and go to the auto parts store and find one marked (like the one I threw away). Thanks for your help.
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Old 06-09-2017, 06:14 AM   #6
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Default Re: Determining relay pins

photo of relay ?

it would be easy to test
check for continuity
the pins with continuity are coil other is load
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Old 06-09-2017, 08:35 AM   #7
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Default Re: Determining relay pins

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Originally Posted by Texas001 View Post
No markings at all. That is the problem. I sent an email to the seller and of course he never replied, just sent me the relay. I think I will just have to toss it and go to the auto parts store and find one marked (like the one I threw away). Thanks for your help.
Found a picture of the relay in question with markings. Don't know why my relay had no markings but the relay is the exact same relay, so the pins are now marked. Now I can following the wiring diagram. Thanks for your help.
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Old 06-09-2017, 11:08 AM   #8
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