understanding diagram
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=136276
Printed Date: May 14, 2025 at 1:07 AM
Topic: understanding diagram
Posted By: astra_rob
Subject: understanding diagram
Date Posted: March 15, 2014 at 11:59 AM
Im trying to get my head around a diagram on the the site but im curious about one thing. I want to add this to an alarm system, but i cant work out what the circular icon is, with the ORANGE / brown x/l. Hope someone can help, many thanks.
https://www.the12volt.com/relays/page4.asp#lf3
Replies:
Posted By: harryharris
Date Posted: March 15, 2014 at 12:07 PM
It's a flasher relay feeding a light unit, e.g. indicator or headlight.
All decent alarms sold have one or two light outputs already.
DEI, Clifford/Viper etc. One white split via diodes for the indicators.
Cobra as sold in Europe 2 x yellow. Etc.
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Test before boxing up.
Posted By: astra_rob
Date Posted: March 15, 2014 at 1:34 PM
Thank you harry, you've made me realize ive been having a blonde moment. I already have built in relays feeding flashing indicators. Depending on the ampage output of these internal relays, is it possible to connect these to the main beam circuits also or am i likely to need to add a spdt relay? Thanks for your help
Posted By: harryharris
Date Posted: March 15, 2014 at 2:35 PM
Yes definitely but not necessary for a SPDT that's 5 pins, you only need a 4 pin SPST relay or don't use 87a on the type you mentioned.
If headlights you'll need a 15 amp fuse as well to supply the relay(s)*
*Some cars have twin isolated high and low beam circuits.
From what I know about the Astra, after 2005 you'll have to pick up the headlights around the front fuse box area, it's all CAN data inside the car.
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Test before boxing up.
Posted By: harryharris
Date Posted: March 15, 2014 at 4:31 PM
Just thought of something, after you join to the alarm indicator wire(s) you need to insert a diode 1N5404 between the relay join and where you join to the indicators, band side towards the indicators.
Otherwise using the indicators whilst driving will bring on the headlights.
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Test before boxing up.
Posted By: oldspark
Date Posted: March 15, 2014 at 10:54 PM
Keep in mind that that circuit requires a headlight - or at least 2 x 21W bulbs or 50W resistor etc - for the flasher can to work UNLESS hyperflashing is acceptable OR a non-load sensitive flasher as used for LEDs etc (except in OEM vehicles) is used.
IMO for flashing other loads or low power things it's much better to use an electronic circuit - eg, 555 timer or any of several simple designs; sometimes available in kit or module form (maybe some DEI relay?).
Posted By: harryharris
Date Posted: March 16, 2014 at 2:09 AM
It's an old diagram, any way it just occurred to me that if you were using an ON/OFF flasher circuit you wouldn't need it anyway.
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Test before boxing up.
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