Tail light Relays
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=19980
Printed Date: April 29, 2024 at 2:54 PM
Topic: Tail light Relays
Posted By: lil_joker2k2
Subject: Tail light Relays
Date Posted: October 12, 2003 at 12:54 AM
Hey guys, I just got some jaguar tail lights for my car and i was wondering if theres any way i can make my blinker also a turn on as a tail light and brake light but also work as a blinker when i put the blinkers. Do I only have to tap into my + of the tail light into the blinker with a diode so i wont get feedback when i use the blinker or do I need a relay?
Replies:
Posted By: lil_joker2k2
Date Posted: October 18, 2003 at 12:50 AM
anyone? anyone at all?????
Posted By: lil_joker2k2
Date Posted: November 12, 2003 at 12:48 PM
anyone?
Posted By: defective
Date Posted: November 15, 2003 at 9:23 AM
ummm.... yeah you'll have to hook up a diode between the brake light and the signal light so that the blinker doesn't flash the brake lights but this issue is, your blinker light is only a single element light, which means it will not be dim like a running light, it will have two options, on or off. So yes, you can do it but the signal bulb will ony come on with the brakes. Also this may be illegal in your area, you may want to check your local laws before doing this, some states will not allow the brakes and signal to be together as when you ally the brakes, you will not be able to tell if the signal is on, and since most people hit the brakes before turning, it would in essence suck (for the guy behind you) you'd get alot of fingers. "Use yer signals ***hole"
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Posted By: lil_joker2k2
Date Posted: November 17, 2003 at 2:51 PM
Yeah i kinda figured if I hit the breaks you wouldnt be able to tell if the blinkers were on. Oh well, cant have everyting u want lol thanks defective.Although it took over a month to get a response, thank you
Posted By: defective
Date Posted: December 08, 2003 at 8:47 PM
np
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Posted By: -doh-
Date Posted: December 15, 2003 at 9:45 PM
best way to do this is go get ur self a new hosing.. with a lightbulb for both break & signal... you can find it at any car parts place... right now ur bulb will only have + & - wires if u get the new break & signal hosing ull have 2+ and 1 - .. so you can hook one of the + up normaly & tap the other one into rhe talelight/breaklight wire..
Posted By: hotwaterwizard
Date Posted: December 24, 2003 at 8:44 PM
Here is a Circuit I found in the Encyclopedia of Electronic Circuits Volume 1.  ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: superchuckles
Date Posted: January 01, 2004 at 9:44 PM
what you could have done, is - put a relay on each of your brake light bulbs, that when on, provide power to each bulb, and when off, they ground that side of the bulb. then for each rear turn signal wire, you put a relay on the opposite side of the brake light bulb, that does the same thing (i.e. power on when relay on, ground on wire when relay off). this is by far the simplest way to do it, and it will accomodate all situations. to make it sound simple without yet ANOTHER drawing.... lets say we put the turn signal relays on each bulbs right hand wire, and brake relays on the left hand wire. turn signals off, hit brakes - brake relay comes on, provides power on left hand wire, right hand wire grounded because turn signal relay off. hit turn signals, same thing, relay provides power to right hand wire, left hand wire is ground because brakes off. now, hit brakes, and turn on turn signals, both both relays come on and provide power on both wires, bulb goes off -- turn signal blinks to "off" - and provides ground on right hand wire, brake light bulb illuminates... turn signal blinks back to "on", relay comes on, bulb goes out. it works..... if you REALLY need me to, i can draw a quick drawing to illustrate...... post here and i'll do that..... it'll eliminate all that stuff in the previous post... it's really quite simple to do.
Posted By: lil_joker2k2
Date Posted: January 03, 2004 at 3:20 PM
THANKS GUYS! i had not checked the site in a while, didnt think anyone else would reply, i'll try to it this weekend..thanks again!
Posted By: lil_joker2k2
Date Posted: January 03, 2004 at 3:22 PM
yea id appreciate a drawing, u kind of lost me lol sorry
Posted By: hotwaterwizard
Date Posted: January 03, 2004 at 11:05 PM
Post the diagram here too so I can see!
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: superchuckles
Date Posted: January 12, 2004 at 4:54 AM
ok, here ya go - there's two possibilities for the types of bulbs you're using, assuming you're using two filliment bulbs (1157's) -- your bulb sockets can be either self grounding bulb sockets, or non grounding (isolated) types. i've included pics for both. -- here's the non self grounding type: 
that one will save you from having to install an extra set of relays - and it prevents the rest of your lights from failing to operate, if you say - had a front bulb burn out. now, this next one is if your bulb sockets ground to the tail light assemblies - you can actually use this in both situations, but it comes at the cost of another relay per side 
i realize that you could use a single relay on each side if you have ground insulated bulb sockets, and let the single relays coil be provided ground by the opposite circuit, but that isn't as reliable - these will operate without being affected by the removal of a bulb on the other side, or in the front (though you may need to get an electronic turn signal flasher that requires little or no load in order to flash, since it will only be loaded down by the current of the front turn signal bulb, and the relay (which is much smaller a draw, but still it will flash most conventional turn signal flashers anyhow - try it first, if it flashes too slow, or not at all, get an electronic one for a few bucks at any auto parts store)
Posted By: superchuckles
Date Posted: January 12, 2004 at 4:58 AM
Ack! i uploaded the same pic twice! sorry about that...... here's the self grounding type pic....... doh! 
Posted By: hotwaterwizard
Date Posted: January 12, 2004 at 4:23 PM
I don't see how this could possibly work with no delay of any kind in the circuit.
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: superchuckles
Date Posted: January 13, 2004 at 2:41 AM
umm, he didn't say it needed a flasher - he said he merely wanted to combine what were seperate circuits (i.e. he wanted both brake lights and turn signals in the same bulbs - where he had seperate turn signal and brake bulbs in the rear). though adding a turn signal flasher would be quite easy - i'm assuming that he already has the flashing part handled.... since he never said anything about needing a flashing circuit
Posted By: superchuckles
Date Posted: January 13, 2004 at 3:13 AM
but before you go using either of those (though they both will work) -- just save yourself a lot of unnecessary bull, go get yourself some new ground isolated 1157 sockets (plastic sockets with their own ground wire in them, that don't ground by plugging the bulb in) - and use this circuit (i don't know why i used 4 relays before, i must of been asleep at the helm - you only really needed three.... 
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