momentary to constant?
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=103191
Printed Date: May 06, 2025 at 2:45 PM
Topic: momentary to constant?
Posted By: mustangfoo
Subject: momentary to constant?
Date Posted: March 18, 2008 at 7:46 PM
Hey all, been awhile since I have been around, I have a question.
I am trying to make a circuit to where a momentary ground will make a signal turn on, and stay on when the car is in ON or ACC, and shut off when the key is removed. I seen this with the relay explanations and what not, and wondering if this would work . . .
IMG]https://www.the12volt.com/12voltimages/momentconstant.gif[/IMG]
Here is what I was thinking would work.
relay #1
85 - negative (-) pulse
86 - fused constant 12v+
30 - fused constant 12v+
87 - to #30 of relay #2
relay #2
85 - constant ground
86 - constant 12v+
30 - from 87 of relay #1
87 - to # 85 of relay #3
relay #3
85 - from 87 of relay #2
86 - constant ground
30 - constant fused 12v+
87 - (newly interupted when not switched on output shut off with key)
That is the correct way of accomplishing what I asked correct?
Thanks all!
------------- Eclipse 8445, Kicker DS60's, Hifonics TXi4400, Eclipse SW6143DVC, and Power Acoustik LT980-2.
Replies:
Posted By: dualsport
Date Posted: March 20, 2008 at 8:37 PM
You could do it this way-
85 - negative (-) pulse
86 - IGN switched 12v+
30 - IGN switched 12v+
87 - to #85 of relay #2
relay #2
85 - from 87 of relay #1
86 - constant ground
30 - IGN switched 12v+
87 - to # 85 relay #2
Diode between 87 and 85 of relay #2, stripe towards 85
Your 12V output will be terminal 87 of relay #2,
which turns on when you give it the momentary
ground pulse with the ignition on, and turns
off when you shut the ignition off.
Posted By: mustangfoo
Date Posted: March 20, 2008 at 11:24 PM
thanks a lot for that, it will save me a relay or $2 lol! :)
------------- Eclipse 8445, Kicker DS60's, Hifonics TXi4400, Eclipse SW6143DVC, and Power Acoustik LT980-2.
Posted By: dualsport
Date Posted: March 21, 2008 at 1:06 AM
Actually, you don't even need the diode, just connect 85 and 87 directly, just as the diagram shows.
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