stiscooby

I have a Clifford 300 Alarm which was fitted to my Scoob by the previous owner.

I think I have a faulty sensor on my alarm. It normally causes a problem when I have washed it or its raining/standing outside over night so water is getting onto a sensor.

I have determined that it’s the bonnet sensor as I have counted the number of times the light flashes after it has gone off.

What I would like to know is how long is the warranty on this alarm? I gather I would have to pay for the labour but what about parts are these very expensive?

Any info appreciated.

fin

Get a 1K ohm pullup resitor on the bonnet switch input (Inside the car)
As a bonnet switch switches to ground, and usually it's input is a FET style input on a chip which means something as minor as a drip of water can conduct enough electricity to make the alarm think that input is grounded, a 1K resistor obviously has far less resistance than water and keeps that input 'pulled up' to 12V until the bonnet switch contacts genuinely switch to ground.

chiark

Yep, do what Fin says. Another option is to just grease the bonnet connector very well, but that'll eventually lead to the same problem.

stiscooby

Fin - Thanks for that, only thing is aint really got a clue what your talk about! not that technically minded you see

Will see what I can find out.

fin

Go to your local Maplins or RS and ask for a 1K ohm pullup resitor you should get change from 10p for this, and also a two inch piece or heat srink. Follow the single wire from your bonnet pin if you can into the car if not to somewhere dry, the cut the wire and solder the resister in (trim the legs down) then seal with the heat srink by running a hot source eg. lighter under it until it srinks around you whole joint.
Explain what you are doing and they will sell you the correct size of heat srink as the diameter varies.




[http://www.raymondaudio.nl/images/project6/4.jpg]

soldered to cable

http://www.raymondaudio.nl/images/project6/5.jpg

started to heat srink



[Edited by fin - 20/03/2003 14:45:07]

[Edited by fin - 20/03/2003 14:45:50]

stiscooby

Ah thanks for that, I will give it a go

Help much appreciated!