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Parasitic Battery Drain??
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TOPIC: Parasitic Battery Drain??
#34210
Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
My mk2 MR2 rev5 has drained twice recently after being left idle for 3 - 4 days, beofre that not alot of driving. Done a bulb test on the battery tonight while removing fuses..seems the dome circuit is the drain..don't have the exact multimeter reading but I pulled the fuse for now from the frunk...

any ideas guys, unplugged the radio from behind, same with cig lighter and unplugged the alarm siren as it wasn't working..cheers. Battery is putting out about 14.15 volts running.
eringobragh
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#34222
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 313
How old is the battery itself? I've seen anywhere between 4-7 years life out of a battery.
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#34224
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
Quandry wrote:
How old is the battery itself? I've seen anywhere between 4-7 years life out of a battery.

2 months old! Brand new- it does have a warranty but I've a feeling its not the battery...I'd eave my primera idle and go away for 2 weeks and she'd start first time! I drive the car every 2-3 days at the moment.

I'm at a loss but have a feeling its related to the security system TVSS.
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#34255
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 327
Whats wired into the dome light circuit, perhaps you need to do a bit of diggin to find any unoriginal wiring.

But as you say yourslef it could be the security system, although if it's an priginal Toyota install it should be ok.

Then again, thinking a bit more, I would remove and clean up the door open sensors and earths to make sure you not getting a earth drain to the body.

Any electrical guru's out there, Swagger! Spanky!
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#34284
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 217
Firstly, you need to measure the battery voltage when the car is not running. Keep measuring it as the car is started (second person needed obviously). When the starter motor is ticking over you should see a drop from the initial voltage. Initially your voltage should be in the range of 12-14V and should only drop by 1-2V if the battery is healthy.

Measuring the voltage across the battery when the car is running tells you the voltage output of your alternator.

Not sure what the dome circuit is, but BGB will help identify what is wired from what:

mr2.ie/mr2/bgb/mk2/electrical/system_circuits.html

The usual suspects for battery drain tend to be alarms and stereos (incl amplifiers). Basically items that either pull a constant current like the alarm system, that have developed a fault, or items that switch on with the car and have a constant +ve connection, like your stereo.



Short of anything else, get the battery replaced where ever you bought it, as it may be faulty.
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#34288
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 137
eringobragh did you do any jump starting from another car recently ?
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#34296
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
Yep I jumped it but not a lot of effort as it had 9.6 volts.

The dome circuit consists of the Alarm, Radio and interior lights...I guess I'll have to trial and error it..
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#34300
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 137
Are there any warning lights staying on, on the dash ?
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#34301
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 137
I remember jump starting a Diesel Camry and ended up having to replace the rectifier in the alternator.
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#34318
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
well since I took out the dome fuse its starting perfectly, I might check if I have a factory amp, I read a few places that it can cause problems due to water damage, etc and its supposed to be located where the water was dripping from my Tbar!!!

the switches seem fine on door and boot, I reckon its either the alarm or stereo...but who knows...at least I have a work around for now

looked at the ciccuit diagram and theres a fair few switches associated with the alarm that I missed so something to look at the weekend.

Appreciate the help lads!
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Last Edit: 2011/08/25 21:29 By eringobragh.
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#34340
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 217
I think the stereo systems were only installed with the factory subwoofers that wit in the cubbys behind the seats. That said, they could have been ripper out and the amps left behind.

The BGB shows the locations of the amps as well - saving you ripping every panel off the car
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#34358
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
hmm not sure how to get my multimeter working for testing this drain its coming up 00.0...I'm obviously doing something wrong. as it lights up the test light..

Its this one here I have: www.maplin.co.uk/domestic-multimeter-37279

Anyway would a faulty alarm siren cause a drain..mine doesn't work due to filling with water at some stage..have to get a part for it from the scrappies but would disconnecting it work or would it have to be bypassed?????

Cheers guys
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#34384
SOLVED: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
Solved lads:

I was using the bulb and not the multimeter however I reckon I didn't the siren disconnected long enough!

I wasn't using the multimeter in the 10a DC setting the other day : n00b

Anyway found out it was drawing 150ma...after disconnecting the faulty alarm siren its putting out 20ma...just an FYI for those who may have similar issue!

I'm looking for an alarm siren if anyone has one spare!
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#34390
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 137
I'm glad to hear you got that problem sorted. Those kind of things annoy the crap out of me.

A multimeter is a good investment. Anybody who works on their own car should seriously consider buying one.
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#34395
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 106
Yeah definately I think I got that multimeter about 5 years ago in maplin for 4 euro!

Anyway an FYI for anyone looking to do this - move the positive probe to 10ADC unfused link

Remove the earth from the battery - stick the multimeter to 10a (like below) and put the probes between the battery and the earth lead..remove fuses until it drops to a reasonable level 0.02 = 20ma...average consumption should be 20 - 50ma!


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#34399
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 313
well done fixing the prob and fair play letting others know how to check it also. here's a kc!
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#34418
Re: Parasitic Battery Drain?? 7 Years, 10 Months ago Karma: 217
glad you got sorted dude
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