Anish1905
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Registered: 5th Jun 03
Location: Croydon, South London
User status: Offline
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hi guys i have a cheapish alarm but it doesn't have the option with a flashing led. I bought 1 and now i want to wire it. Where can i wire it so that when the car is off it turns on and when car is on it goes off. I knw i can wire it stright to the battery but then its always on. Any help would be great cheers
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Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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even though the alarm dont have the option it will come on when the cars off and go off when its on so wire it into the live on that
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Greg_M
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Registered: 2nd Sep 03
Location: Grantham, Lincolnshire
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wire it to the alarm, so it works when the alarms activated
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Anish1905
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Registered: 5th Jun 03
Location: Croydon, South London
User status: Offline
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so wat u mean to say is that where the alarm's red wire is the postive one cut a little bit and stick it on that? and the side to the negative part of the battery?
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Dom
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Registered: 13th Sep 03
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if you just take the pos and neg of the alarm, surely that will always be live, since its directly taken from the battery? 
I would look for something that gets switch on when the alarm arms, like a seonsor or something (there must be a connection on the thing that does that), then either splice into it, on wacka relay on the thing and take oneside to the LED 
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Greg_M
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Registered: 2nd Sep 03
Location: Grantham, Lincolnshire
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one will be an earth mate, you can earth that anywhere on the car, under a body work bolt, to splice into a wire
disconnect the battery,
get the wire and cut a little bit of plastic off,
wrap the other wire around this and solder on,
then insulate using shrink wrap.
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M2RTY
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Registered: 25th May 01
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most alarms work off creating earth for auxillary outputs
if it has this option, u would connect the led to a live 12v and then connect it to the earth on the alarm
thats how my clifford circuits work for adding extra leds, scanners, and relays
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M2RTY
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Registered: 25th May 01
User status: Offline
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ps - u could build a not gate or relay to work when power is off
or have it on all time
or on a switch
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Dom
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Registered: 13th Sep 03
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mate, give us the model and make of alarm and ill have a butchers and see if i can find a tech spec or something and see what there is you can use to wire up the led to come on when its armed.
Btw mate, make sure the led is a flashing jobby 
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Anish1905
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Registered: 5th Jun 03
Location: Croydon, South London
User status: Offline
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well its a cheap 1 so no  i got it from maplins its the shark £30 one.
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leon_in_uk
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Registered: 16th Sep 03
User status: Offline
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cant you get just leds from motor world etc...? do they come with instructions?
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Anish1905
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Registered: 5th Jun 03
Location: Croydon, South London
User status: Offline
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well M2RV H i do have the option to add ulta sonic sensors or a boot lock thing so i wonder if its that ur taking about. just had a look on the manual it says that the negative part could be added on to any eath source so if i connect the postive to the red which goes to the battery and the earth 1 to a bolt of my chosing should that work?
U can buy the leds from anywhere really maplins charge £1.20
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Dom
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Registered: 13th Sep 03
User status: Offline
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it says on the description that the 3rd wire is a ground or sumthing, so yea, wack the led pos on live pos going to the alarm and the negative on the "3rd wire" and it should work mate
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