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Author Topic: Odd alarm problem?  (Read 3010 times)
davidewanprice
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« on: July 15, 2012, 12:16:15 am »

Hi guys,

Odd electrical question, I have an alarm fitted to my car and the range of the key fob when first bought was fine, in recent years has been poor, as Is the life of the battery but it seems to be the alarm that's running it down.. Battery is new and very strong.. Anyway was playing around and found that if I remove the fuses from the board the alarms key fobs range increases from 2 mts to 25 mts, any ideas?
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davidewanprice
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« Reply #1 on: July 26, 2012, 09:01:53 pm »

Ok I've had a little more time to play and it's the 16A fuse second from left (looking from front of car) that by removing, increases the range of the Alarm fob, put it back in and alarm fobs range is back to 1 mtr. This second fuse seems to affect radio, indicators (involved with alarm) and interior light. The other thing is if you activate the alarm without the second fuse in after a few minutes the Alarm goes off...


Any ideas, please help!
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Oetker
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« Reply #2 on: July 26, 2012, 11:28:49 pm »

Difficult to say because it is not realy standard on the Murena.
Only thing you can do is look if the tesion on the alarm-unit is optimal.
New battery in the send unit and for the rest it's a job for a specialist who probably will replace the whole thing.
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I feel like Jonah, only my fish looks different.
Murena 2.2 Red 1982. Murena 1.6 black on places.
davidewanprice
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« Reply #3 on: July 28, 2012, 04:07:02 pm »

Well I'm still playing, it's nice and sunny and I can narrow it down to an issue between the alarm and stereo as if I put the fuse back in the board, unplug the stereo I get an alarm that worms correctly.. Since the stereo is fed on two leads only I think it has to be caused by interference between the two.. My stereo uses a permenent live from the cigarette lighter (red wire) and an earth (black)
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davidewanprice
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« Reply #4 on: July 28, 2012, 07:47:35 pm »

Ok, it looks like if you take off the earth there's no change, stereo still works and alarm fob range poor, so it has to be a live issue...(as its the only wire left). The one red live feed from the cigerette lighter feeds both the stereos ignition live and perminent live feed. Remove one of these and the stereo doesn't work? However if you remove one, it cures the alarm... So I pretty much know my problem, I just don't understand how to fix it... Any ideas?

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Oetker
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« Reply #5 on: July 28, 2012, 08:21:56 pm »

In most cases the connectors at the fuse-panel make the problems.
Clean polish them and put some acid-free vaseline on it.
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I feel like Jonah, only my fish looks different.
Murena 2.2 Red 1982. Murena 1.6 black on places.
davidewanprice
Guest
« Reply #6 on: July 30, 2012, 01:41:00 am »

Maybe but in this case if you can make an alteration by disconnecting the stereo it's unlikely to be a fuse issue, I called the guys at the place I had the alarm fitted, they say replace the batteries in the fob, again, I disagree... It has to be an interference issue of some sort... Guess I'm going to have to try to find a wiring installation diagram and check each wire....
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Oetker
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« Reply #7 on: July 30, 2012, 05:50:17 am »

Maybe but in this case if you can make an alteration by disconnecting the stereo it's unlikely to be a fuse issue, I called the guys at the place I had the alarm fitted, they say replace the batteries in the fob, again, I disagree... It has to be an interference issue of some sort... Guess I'm going to have to try to find a wiring installation diagram and check each wire....

As you said, odd problem, so expect a odd solution.
Did you measure the tension at the unit?
The stereo can function good on 10 volt where the alarm wil cut in range.
Most fall in tension are on the fuse-panel or contact-lock.
It is impossible to give a clear ready solution, because of little information how it is build up and not part of the standard on the Murena.

Greetz Oetker
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I feel like Jonah, only my fish looks different.
Murena 2.2 Red 1982. Murena 1.6 black on places.
Jon Weywadt
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« Reply #8 on: July 30, 2012, 10:51:31 am »

Hi guys,
------
 Anyway was playing around and found that if I remove the fuses from the board the alarms key fobs range increases from 2 mts to 25 mts, any ideas?

Hi David.

Have you checked the voltage to the alarm before and after removing the fuses? I don't recall what the 16A fuse you mention is for, but perhaps the circuit draws down the voltage to the alarm.

A possible cause could be a grounding problem. A missing ground could perhaps place the alarm in series with another equipment thus reducing the voltage and current available. Similar, if you draw the alarm power from a wire to another equipment, and that equipment has a poor ground, then the same could happen.

Good luck. Smiley
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davidewanprice
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« Reply #9 on: August 03, 2012, 04:39:13 pm »

Ok I've been in touch with the guy at scorpion alarms and it's simply down to not having a feed from the ignition so as soon as I feel up to it I'm going to sort that.. I've also found the feed on the alarm to attach a boot solenoid so I can simply open the boot with the key fob..
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