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Battery drain ?????
#1410599
12/02/2013 22:21
12/02/2013 22:21
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Joined: Jun 2008
Posts: 315 Kent
Rob_78
OP
Club member 1081
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OP
Club member 1081
Making a profit
Joined: Jun 2008
Posts: 315
Kent
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Just wondering if anyone could tell me if I could/how to check battery drain on a multimeter OR would I need something else.
The car in question is a 2000 VW Lupo GTI with 114k, changed many battery in the last couple of years & now have another good battery on it, I've checked charging & all is good with loaded & unloaded. The engine seems slow to turn over & the central locking shunts when starting. Was also thinking of possible the starter motor is pulling big amps...... still need to check this when I get 5mins. A fully charged battery will last a week then these problems begin. There is a sub/amp fitted with a switch to turn the amp (blue wire) off.
Any help/ideas would be great.
Cheers
LE 557 - full on resteration in progress
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Re: Battery drain ?????
[Re: Rob_78]
#1410650
13/02/2013 07:45
13/02/2013 07:45
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Joined: Dec 2005
Posts: 33,568 Berlin
barnacle
Club Member 18 - ex-Minister without Portfolio
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Club Member 18 - ex-Minister without Portfolio
Forum Demigod
Joined: Dec 2005
Posts: 33,568
Berlin
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Without knowing the particular vehicle, so just general hints for this kind of thing...
You'll need an ammeter with a current range of at least ten amps - most cheap digital multimeters will do the job. Alternatively, the low-tech solution is a 12v bulb and a bit of wire...
Remove master fuse, if there is one, or the battery positive lead if there isn't, and measure the current across its holder (or stick the bulb there and see if it lights up). Ideally, the only standing current with the ignition off and the doors closed will be a few tens of milliamps feeding the alarm, the remote locking, and possibly a keep-alive on the radio.
If you're seeing more than that, you then need to start removing fuses from the fusebox. When you find one that suddenly decreases the current, you've found your problem. If removing all of them doesn't remove the current, probably best - unless you have at least a detailed wiring diagram - to get an auto electrician in.
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Re: Battery drain ?????
[Re: Rob_78]
#1410805
14/02/2013 00:20
14/02/2013 00:20
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AP1
Unregistered
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AP1
Unregistered
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As above, around 30mA max is good.
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Re: Battery drain ?????
[Re: Rob_78]
#1410886
14/02/2013 13:38
14/02/2013 13:38
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Joined: Jun 2008
Posts: 315 Kent
Rob_78
OP
Club member 1081
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OP
Club member 1081
Making a profit
Joined: Jun 2008
Posts: 315
Kent
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Cheers guys for your input.
Headunit is standard vw tape player with multichanger fitted below.
Will hope to get a chance to look at it this weekend :-)
LE 557 - full on resteration in progress
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Re: Battery drain ?????
[Re: szkom]
#1411138
15/02/2013 17:33
15/02/2013 17:33
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Steamer
Unregistered
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Steamer
Unregistered
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Sorry ti Hijack your thread,but my coop has similar issues. I left it for two days and nothing,totally dead! This also happened two weeks ago and I thought the new battery I put in was faulty so I took it back and got it replaced with a highr voltage/starter battery. The open door warning light appears on at times so I slam it shut while driving. Also had a new DAB radio fitted recently so Im thinking about what you guys have said above? I havnt noticed the interior light on though. Thoughts?
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Re: Battery drain ?????
[Re: Rob_78]
#1411186
15/02/2013 22:05
15/02/2013 22:05
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Joined: Oct 2011
Posts: 702 Cornwall
jasgol
Enjoying the ride
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Enjoying the ride
Joined: Oct 2011
Posts: 702
Cornwall
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It could be the head unit, see this thread
Horsing around's a serious business.
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