Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: scottambrose on 05 April 2013, 08:16:28
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where can i get hold of a wiring diagram for the fuse fv5 ontop of the battery to find out where it feeds. i know the fuse numbers it goes to in the car but the issue i have with a drain is not with any of them, so it must feed something else aswell.
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FV5 feeds : F1, F6, F7, F10, F20, F25, F27, F35
In addition, it feeds the immobiliser and <sound of distant alarm bells> the Anti-theft ECU and power sounder!
No points for guessing which is the prime suspect out of that lot.
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it has no power sounder. i removed that 6 months ago. :y
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OK.. So, if you remove all of those fuses, do you still get current drawn through that fusible link?
How much current is drawn?
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having put my amp meter in series with the earth lead. im getting 0.03 amps. with all the fuses in the fuse box taken out i still have the draw unless i remove fv5. so its nothing that runs any of those fuses. so its got to either be imobiliser or a wire between fv5 and the main fuse box under the dash? the battery is testing down to about 12.3 volts after about a week from being fully charged, and have fitted 3 new batteries.
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0.03a doesnt seem that much. Is the battery being charged properly when running?
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30mA probably isn't far off the mark
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30mA probably isn't far off the mark
Yep, I'd expect double that, TBH. Current drain isn't your problem, by the sounds of it.
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I have exactly the same problem. http://www.omegaowners.com/forum/index.php?topic=112748.msg1421664#msg1421664 (http://www.omegaowners.com/forum/index.php?topic=112748.msg1421664#msg1421664) But mine was draining 0.2amp are you sure you are only seeing 0.03amp? That wouldn't drain your battery that fast but 0.3amp would.
I took out the power sounder but lost my clamp meter after that so don't know if it is fixed yet but I think not. I now have a replacement clamp meter, does DC amps will run it over the wires coming out of FV5 next week any suggestions which ones to try? To test I leave the bonnet up with a brick on the alarm button and wait 20 mins or so.
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I had my ampmeter set on 10 amps and when i tried it ,it defo said 0.03 and fluctuated to 0.04 the drain must be intermittant some days i can check the batteryand its charged then few days later its down to 12.3 volts
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according to an OOF post I read the battery drain should settle to 0.06 - 0.08amps on a non problem mig. That seems a little high to me (at 0.08amps draw a 66a/h battery would be completely flat in 1 month) but anyway 0.03amp shouldn't cause the problems you are getting. What is the drain if you disconnect the battery earth and put the meter between the car earth and neg terminal, or positive terminal and positive lead? (don't run anything heavy while doing that it will blow the fuse in your meter). That will show the total drain.
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doing that its 0.03 amps. i dont the the car for a lot of long journeys mainly round town with a longer trip say of about 60 miles at weekends. but ive never had any problems with other cars that only do short journeys.
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stupid thing wouldnt start again this morning. luckily i carry a little 063 battey in the boot and some leads. so jump started it. then drove it half a mile to work and its started 3 times on the trott. >:(
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Can you try measuring the current again, but carefully go down the current ranges on the multimeter? The 10A range might not be accurate enough to measure down at 30mA. Ideally, go down to the 100mA range, or whatever the meter has which is closest to, but above, the expected current of about 60-80mA.
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ok il try that, it was another btrand new battery on saturday. its never lost charge this quickly before.
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im going to try and remove the relay for the heated rear window. in the hope that is coming on randomly. any ideas which one it is.
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Fuse box under column :y
Open the lid, switch ignition on and turn switch on and off, should jump out at you :y
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well is wasnt that. but. the battery has drained again over night and the drain is now showing .41 amps it was 0.03amps. if i disconnect that main 80aqmp fuse on the battery box which is fv5 the drain goes. but i have checked all the fuses in the fuse box and none show any drain other than the door lights( as i had door open) but that goes if i hold plunger in. the immobiliser also runs from that circuit i think so that must be the culprit. but how can i test it. ive also unplugged every relay in the fuse box and the box next to the battery and it still showed between .41 and .35amp
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Time delay relay for the rear fag lighter is a common place to start ;)
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nope that works as it should ive left a small usb charger in it with an led and that goes out after a while and comes back on when you unlock again. i just joined the wires back up for the boot mod i did and unplugged the plug from the box in the footwell it goes into and the drain has gone back to 0.03 amps then unjoined the wires again as it was before and still its at 0.03 amps. which doesnt make sense, the drains now gone. but all i did was touch that box
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nope that works as it should ive left a small usb charger in it with an led and that goes out after a while and comes back on when you unlock again. i just joined the wires back up for the boot mod i did and unplugged the plug from the box in the footwell it goes into and the drain has gone back to 0.03 amps then unjoined the wires again as it was before and still its at 0.03 amps. which doesnt make sense, the drains now gone. but all i did was touch that box
Boot mod?
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well is wasnt that. but. the battery has drained again over night and the drain is now showing .41 amps it was 0.03amps. if i disconnect that main 80aqmp fuse on the battery box which is fv5 the drain goes. but i have checked all the fuses in the fuse box and none show any drain other than the door lights( as i had door open) but that goes if i hold plunger in. the immobiliser also runs from that circuit i think so that must be the culprit. but how can i test it. ive also unplugged every relay in the fuse box and the box next to the battery and it still showed between .41 and .35amp
Was the .41 amp 10 minutes after the car was closed down or before that?
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after 10 minutes. but that was also with all the fuses and relays removed.
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i unplugged the central locking control box plugs and then plugged them back in and it went down to 0.03 amps from 0.36
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Just checked mine (remember I pulled the powersounder out) the drain is now about 0.05 amp on my clamp meter. It's not really precise at such a small range so proably give or take a couple of 0.02 amps. That's after the car has settled and arming the alarm made no difference.
I'd be happy with that it seems to be within spec but my new battery is currently 12.4V - 72% charged. I would expect it to be kept higher than that.
Possibly the 0.05amp is rising when I'm not watching. I have a meter with computer output that can log every second, it would be a hassle to set up but I may try it. First though I keep a manual log of the battery SOC.
What happens to your battery volts if you pull the fV5 fuse and leave it overnight?
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here's a useful chart I made to convert voltage to State of Charge
(http://i1321.photobucket.com/albums/u546/dbdbx/batterysoc_zpsdfc5e5e8.jpg)
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Voltage drop is minimal without fv5 in overnight ive re charged battery and tested it its fully charged and said 13.2volts but thar was only anhour afterbeing taken off. Il check it again in themorning
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you'll get a surface charge above 12.8V after charging it will soon go when any load is applied. Anything 12.8V or above after rest is 100% SOC. A kanckered battery could read 13V+ after charging but not start a car mind.
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its reading 12.85 volts and starts the car fine, will leave it overnight again and see what it goes down to now its settled.