Alarm Flashing Lights

[E500 TAT]

HI, Could anyone tell me if its possible to wire up an extra warning light to my standard alarm/immobiliser on a mk1 418 tourer, n reg 1995.
i have an old one and would like to put it in a more prominent place for a little extra security.

Cheers everyone, enjoying the site.

[Sejin26]

I dont think you can as it is in the dash binacle. You might be able to run two wires off the back to a new light but I would have to check.

[E500 TAT]

Thanks for that, it would be helpfull

[E500 TAT]

BUMP, Someone must have fitted an extra warning light at sometime?

[Martyn-420T]

Just get a flashing led from www.maplin.co.uk and wire it to you ignition switch. easy as. gives a extra feeling of a alarm on your car.

[E500 TAT]

I know how to do this on a ford,as one of the ignition wires swops polarity when off, how does this work on a rover? any help, i have the light ready to go, just need to know how to wire.

[dR0Og]

I wanted to do this with my ZR and the problem I had was to find a supply that was live when the ign was off but dead when it was on!

Had a great deal of problems doing this but in the end I tapped into the the supply to the micowave sensors as they are only live when the alarm is on.

I dont know if you have anything like this on yours. Maybe a wiring diagram would shed some light onto a circuit you can utilise.

The only other option I can think of would be to use a 12v replay with both NC and NO contacts. Have it controlled by an ign circuit so when the ign is on, the relay is open and when the ign is off the relay is closed. You can then take a feed from a permanat live through a fuse to the LED (it would need a flasher circuit as well unless it has one built in)

With mine, I got 2 replacment alloy door pins with blue LED's which also had an inbuilt flasher circuit so when I arm my alarm the doors lock and the lock pins flash blue


Just another thing, any LED you have needs to be 12v rated or you will need a resistor to step the voltage down to the correct value for the type of LED you are using.

[solarmax]

In the mid 80’s I used to make up flashing LEDs for folks that hadn’t got an alarm fitted (the majority of cars then) but wanted to appear that they had. I sold over 200 of these in quite a short time. Only a few months back, I threw out the last of these, thinking no-one would be interested now(!)

I sourced all the parts from Maplins and I am sure those parts or their equivalent are still stocked. I used the red flashing LED with optional snap on bezel. I soldered a pair leads onto the LED and I also added a small resistor in series to reduce the voltage the LED saw. Unfortunately I ditched the notes I had on which side of the LED was positive, but I’m sure it will be easy to find out. Please note that if the LED is wired up the wrong way around, it will blow immediately. Otherwise it was a piece of cake. What does remain of this project are the fitting instructions. The important thing to remember is in step 3 (once you have got your pluses and minuses the right way round!) is to make a good connection and then leave it. I recommended my customers at the time to split the task up and do steps 1, 2 & 3 at one go then move onto step 4 at a later date. I thought it good advice for a novice, as many of my customers were. This also makes it easier to probe around the back of the ignition switch with a bare wire end trying to find the right connection, as no harm will come to LED during the process.



Fitting Instructions

1. Drill a 8mm dia hole in a suitable position on the dashboard that it can be seen from the outside of the car
2. Fit the LED into the bezel and then feed the cable through the hole until it becomes visible under the dashboard. Push the bezel and LED firmly into the hole until it clicks in position
3. Take the white/black lead and connect it to a permanent live (battery, radio, cigar lighter, clock etc,)
4. Identify the (feed) connection on the ignition switch which is live with the ignition ON, but goes to EARTH with the ignition off. Join the white lead from the LED into this connection
5. The LED will now flash automatically when the ignition is turned off and continue to flash until the ignition is turned on again

The current used by the LED is so small that it would have to be on for months to have any effect, even on a partially discharged battery. Also because the power requirement is so low it will not under normal circumstances trigger an alarm fitted with a voltage drop sensor.



Hope this is of some use to you.

solarmax

[ashy]

Originally Posted by solarmax

Please note that if the LED is wired up the wrong way around, it will blow immediately.

Why do you say that? Not in my experience with electronic components they don't. Unless the current is too high for the rating of the LED or it is a fused type.

A LED works like any other diode. They are polarity biased. A curent will either flow or it won't depending if it's a P-N or N-P type and if the correct charge is applied.
If diodes were to blow immediatley a reverse charge was applied they would be useless in the electronics industry.

[solarmax]

OK ashy, maybe I was wrong on that. I bow to your expertise

solarmax

[lates]

Our coupe now has a Bright blue alarm led in the binnacle and its fast as ******
Previously on car with no alarm, most car accesory shops will sell the led and bezel for a couple of quid then both the wires go to the radio iso plugs ( ign feed and live feed there ) should take all of ten minutes job done. I decided on using the iso leads for the power as I wanted the led to be central position in the car

Lates

[Gene Hunt]

I had an extra l.e.d fitted to the blank plug(where the air con switch )would be on my ZR.Got a mate to do it who fits alarms it was a 5 min job. It only flashes when you turn the key to off I.e not wired up to the factory alarm but looks the nuts it's blue & he gave me the bezel for a clifford so looks like a g5.He took the power from the dash switches but dont now how sorry.

[E500 TAT]

HI, Thanks for that chaps, thats what i needed to know, have the extra flashing led's (blue) and would like to fit them in the shelf supports, i'm going to try and wire into the alarm sensors, here goes.

THANKS AGAIN.

[Martyn-420T]

LED's the longest leg on a led is + and the shorter is -