timed relay for autolock

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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=105995
Printed Date: May 14, 2025 at 10:39 PM

Topic: timed relay for autolock

Posted By: juicedinsanta12
Subject: timed relay for autolock
Date Posted: July 08, 2008 at 5:47 PM

i have a 1986 buick regal, it has power locks and im trying to do the autolock option. i need to know what relay i could use to send momentary power to the power lock accuator. i hooked up a regular relay but it just sent constant power and almost fried it. anyone know what i could use and how to wire it?

Replies:

Posted By: i am an idiot
Date Posted: July 08, 2008 at 7:33 PM

Constant to Momentary Output

The capacitor allows the coil of the relay to be energized until the capacitor stores a charge, thus de-energizing the coil. The resistor bleeds off the charge of the capacitor when positive voltage is removed from the other side of the coil. You can increase the output time by simply changing the value of the capacitor. This one will give you about a 1/2 second output.
posted_image

Posted By: juicedinsanta12
Date Posted: July 08, 2008 at 11:38 PM

looks good thank you, what do i use if i want like a 1 second output?

Posted By: juicedinsanta12
Date Posted: July 08, 2008 at 11:47 PM

....and will this be safe since its going to have constant power the whole time its in park , or in drive?

Posted By: juicedinsanta12
Date Posted: July 09, 2008 at 2:00 AM

....last thing, what relay do i use (specs,size) and what diode?

Posted By: i am an idiot
Date Posted: July 09, 2008 at 6:40 AM

The diode is a 1n4001 or 1n4007 or any number in between. The relay is a standard bosch / now tyco automotive relay. Theoretically 2000 micro farad worth of capacitor should yield twice the time of the 1000 mic cap.

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