Alternating light flash with relays

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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=28516
Printed Date: May 19, 2024 at 8:16 AM

Topic: Alternating light flash with relays

Posted By: titanium
Subject: Alternating light flash with relays
Date Posted: March 16, 2004 at 8:24 PM

I have a postitive light flash wire from my alarm I would like to get my park lights and my head lights to flash alternating and I'm not quite sure how to wire this with relays

Replies:

Posted By: its_radio_shop
Date Posted: March 17, 2004 at 9:57 PM

Its possible to do but some questions would be...

Negative or Positive headlight system? Negative or Positive Park lights? Are the two high beams isolated from each other (require a seperate output for each lamp)? I would probably look into buying a seperate headlight flasher and wiring the control wire to the output of the alarm. Much easier and cleaner.

Posted By: auex
Date Posted: March 17, 2004 at 10:40 PM

It is easy and requires 2 relays.
Relay 1:
85 - +siren output from alarm
86 - ground
30 - constant +12V
87 - +output to relay 2
Relay 2:
85 - +light flash output from alarm
86 - ground
30 - +output from relay 1
87A - either parking lights or headlights
87 - the one not used from pin 87A

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Posted By: its_radio_shop
Date Posted: March 17, 2004 at 11:37 PM

The setup auex shows will only work if you have positive switching headlights and park lights. Some vehicles will be negative in one or the other or both. In most cases even with negative switching headlights you will still have positive switching park lights. Try to determine what you have before hooking anything up.

Posted By: loco_k0pykatz
Date Posted: March 23, 2004 at 12:19 AM

How would you make 2 fog lights flash alternately?

Posted By: Thanasi
Date Posted: March 27, 2004 at 2:14 PM

The same way you would with your parking lights or headlights using two relays.

Relay 1:
85 - +siren output from alarm
86 - ground
30 - constant +12V
87 - +output to relay 2
Relay 2:
85 - +light flash output from alarm
86 - ground
30 - +output from relay 1
87A - either parking lights or headlights
87 - the one not used from pin 87A

Posted By: werox709
Date Posted: May 26, 2004 at 1:26 PM

ok thats one way but hopw to do it if i dont have a car alarm????

can any one help me with that???

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"WErOx"