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Can this be accomplished with a 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=142570
Printed Date: May 13, 2025 at 4:13 AM


Topic: Can this be accomplished with a relay?

Posted By: 65fastback2+2
Subject: Can this be accomplished with a relay?
Date Posted: February 07, 2017 at 4:23 PM

I have an automotive light I want to be able to activate by 2 different signals.

Lets say it is a blinker.

I want to be able to activate the blinker via the normal blinker switch in the vehicle's cab.

But I also want to light the blinker via a bluetooth trigger device as well.

Example: Normal use of blinker, and, at a car show, light the blinker solid via my phone.

Seems I need something 2 input and single output that wont mix the input signals.



Replies:

Posted By: the12volt
Date Posted: February 07, 2017 at 4:40 PM
Cut lead to blinker light(+) wire and add an SPDT relay as follows:

#30 to blinker light side(+)
#87a to blinker light switch side(+)
#87 to 12V+
#86 to ground
#85 to (+) Bluetooth trigger

If you have a negative Bluetooth trigger, connect (-) trigger to #86, and 12V+ to #85.

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Posted By: 65fastback2+2
Date Posted: February 08, 2017 at 8:19 AM
awesome, thanks for your help!


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