Where does my power leak out?
Submitted: Monday, Jan 03, 2011 at 15:21
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GoneTroppo Member (FNQ)
Looking for some guidance as 12v electrics have got me beat once again.
My trusty '94 LR Defender has a Piranha dual battery setup, never missed a beat just does what it's supposed to.
About 2 months ago jumped in to a flat battery, (the car only gets driven once a week or sometimes once a fortnight).
Ok fair enough although the batteries were only replaced 6 months ago.
Put on charger next day good as gold.
Two weeks later same thing. Dud battery? Take then out charge them
check after a week, full 12.8v.
So assume there must be a leak in the car, nothing is turned on apart from the
little red LED on the radio. No bare wires touching anywhere I can find.
Where do I go from here? What do I
check where do I look?
Any pointers much appreciated.
Reply By: farouk - Monday, Jan 03, 2011 at 15:52
Monday, Jan 03, 2011 at 15:52
Hi,
Would suggest so as to determine if the vehicle has a power leakage first I would disconnect positive lead from battery and using a multimeter with setting on amps
Place one end on the lead and the other end on battery terminal, if it has a 0.00 reading it obviously has no leakage via car electrics, if it has you will have to start by removing fuses and
test again and again and again!!!! do not forget to disconnect any little toys (electrical) you may have in vehicle
Obviously if you still do not find the cause there you will have to blame battery.
Farouk
AnswerID:
440574
Reply By: Member - bungarra (WA) - Monday, Jan 03, 2011 at 16:03
Monday, Jan 03, 2011 at 16:03
not sure if the
test is that simple ?
I have repeated problems with my Hilux........sits more than say 2 weeks..flat battery........I have used a clamp meter and one by one tested every circuit that I am aware that is connected to the battery....cannot find any current flow........
Replaced the battery twice with others I have .....same thing.........bench testing the same batteries removed after 6 or so weeks and they are still ok !
The last time the battery was flat and I jump started it (making sure of no spike and with protection in place)...the alarm and central locking no longer work..now I am wondering if that damn device has a current drain more than I would have expected?..and maybe that might have fixed it if the battery survives longer than normal before it goes flat
I am completely satisified that the batteries are ok...there has to be acurrent drain somwhere.....
has me beat
AnswerID:
440579
Reply By: - mazcan - Monday, Jan 03, 2011 at 16:09
Monday, Jan 03, 2011 at 16:09
hi gt
when you reconnect the batteries after removing them to charge up
do you get any sparks at the terminals as you reconnect
if so some thing is on apart from the led on your radio
or you have a direct short eg chaffed wire somewhere or it could be your ignition anti theft device if the vehicle has one ???????
i got caught out wth one on on my subaru in the past
disconnect the auxillary battery and piranha system see if the main battery goes flat on it's own
if it doesn't then the problem is in the piranha circuitry the problem could be in the dual battery switching device/system
hope this is of help to you
it's annoying thing to have this happen with new battery's
cheers and h-n-yr
AnswerID:
440581
Follow Up By: GoneTroppo Member (FNQ) - Monday, Jan 03, 2011 at 16:33
Monday, Jan 03, 2011 at 16:33
Mazcan farouk & rob.
Have put multimeter from terminal to clamp with the meter set to 10A I get .24 and .25 alternating. so looks like a quarter of an amp going
places.
Now what would draw that sort of power? guess I'm hoping to short cut the
test every circuit bit.
Disconnecting the Piranha could be a bit tricky there's an awefull lot of wiring there.
As for anti theft device, It's a Land Rover Defender!!!! The whole thing is an anti theft device :-)
FollowupID:
712495
Follow Up By: Member - John and Val - Monday, Jan 03, 2011 at 18:32
Monday, Jan 03, 2011 at 18:32
Gonetroppo, a few thoughts:
I assume the ignition and accessories were turned off when you measured that 1/4 amp. If so, you have localised your problem a bit. It is not in the battery itself. The obvious things that come to mind to draw a steady 1/4 amp are a radio (AM/FM or maybe UHF?) or a small lamp. An insulation
breakdown somewhere is very unlikely to give a nice steady reading. Leakage through a crook diode in the alternator is a possible, but I'd first rule out the radio/s.
I see you're in FNQ. From what we hear it's very wet up there - do you have a trailer connector full of wet mud? That could do it too.
Suggest leave the meter connected and showing a 1/4 amp drain, then one by one take out a fuse and then put it back, until the meter drops to zero - you have found the one that's carrying that 1/4 amp.
Check what's running off that fuse (you do have a manual? )
You mention that you have a red light on the radio - why is it always on? Has anything changed around the radio? Think I'd be pulling the radio out and unplugging it before going much further.
HTH
John | J and V
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein
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FollowupID:
712505
Follow Up By: Allan B, Sunshine Coast, - Monday, Jan 03, 2011 at 19:38
Monday, Jan 03, 2011 at 19:38
Gone Troppo, Chose not to raise it before for fear of being accused of Product Bashing, but when I first got the Troopy it suffered from a small current drain which turned out to be the Piranha battery isolator. Chucked it out in favour of a Redarc. No more trouble.
Now I'm not saying it IS the Piranha but it COULD be!
FollowupID:
712513
Follow Up By: redeye141 - Wednesday, Jan 05, 2011 at 08:44
Wednesday, Jan 05, 2011 at 08:44
GoneTroppo,
Try reading the amp meter on DC. AC will give you an inaccurate reading. You may find the current draw is 1.414 x AC reading.
Redeye
FollowupID:
712636
Follow Up By: fisho64 - Wednesday, Jan 05, 2011 at 09:03
Wednesday, Jan 05, 2011 at 09:03
Gonetroppo-now that you have found .25 amps draw, just start removing fuses til it stops.
FollowupID:
712637
Follow Up By: GoneTroppo Member (FNQ) - Wednesday, Jan 05, 2011 at 10:00
Wednesday, Jan 05, 2011 at 10:00
Thanks for those ideas.
John, the red LED on the radio is a very poor mans anti theft device. it does nothing but stay on to warn potential thieves of the dire consequences of messing with the car. (I asked the LR dealer when I bought the car new and that's what I was told)
Fisho I removed All fuses (see further down thread) no change hence my problem
Redeye I "sort of" get what you're saying, but not sure how to do this. I have been using the section of the multimeter that has a A and a line with three dots underneath which I thought was DC. (maybe not)
FollowupID:
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Follow Up By: redeye141 - Wednesday, Jan 05, 2011 at 10:11
Wednesday, Jan 05, 2011 at 10:11
Yep you are correct. you are measuring DC.
as you say next step is to remove the wire to the alternator and see if the current falls to zero.
redeye
FollowupID:
712643
Follow Up By: Who was that again? (Vic) - Tuesday, Jan 11, 2011 at 16:31
Tuesday, Jan 11, 2011 at 16:31
Allan, i would beg to differ on the prescription of an improvement by fitting a Redarc. That is unless the switch wire is fitted through an accessory power voltage. I have disconnected my Redarc capability to steal 0.6a/h every hour it is connected/ Yes, they can deplete to the extent of somewhere between 14-16 a/h a day. If you are using them in something with
solar power, that is quite a proportion of what you can gain. Perhaps two hours charging or more a day :-O
FollowupID:
713575
Reply By: Allan B, Sunshine Coast, - Monday, Jan 03, 2011 at 16:09
Monday, Jan 03, 2011 at 16:09
There are two possibilities which you can
check without using a meter.
Remove both batteries and charge them fully on
the bench.
Allow the batteries to stand unconnected to anything for about 5 days.
Replace one only battery into the vehicle and connect. If there is reduced charge in the battery it indicates a faulty self-discharging battery.
Repeat this
test with the other battery.
If the batteries have retained a goodly charge during the 5 days on
the bench it suggests that the batteries are in reasonable state and if they then discharge when connected in the vehicle it suggests some circuit drawing current from the battery. Then you would need to do some testing with a meter..... a little more tricky and beyond the scope of this advice.
Good luck.
AnswerID:
440582
Follow Up By: Member - Phil G (SA) - Monday, Jan 03, 2011 at 18:56
Monday, Jan 03, 2011 at 18:56
Allan,
Since your post, the batteries have been shown to have a 250mA parasitic drain, so looks like the batteries are unlikely to be the problem.
But as a fellow 70series owner, have you ever tried to remove the batteries from a Defender with dual batteries? I had to jump start a Defender once - it was a bit of fun! First issue was working out how to tilt/remove the front passengers
seat (the owner wasn't sure) and then finding two batteries crammed under the
seat. Removing them would have been a bit of work. But you could do the same with them in the vehicle.
Cheers
Phil
FollowupID:
712507
Follow Up By: Allan B, Sunshine Coast, - Monday, Jan 03, 2011 at 20:31
Monday, Jan 03, 2011 at 20:31
No Phil, I haven't had my hands on a Defender and that seems fortunate? They are a good bus but do seem to have some idiosyncrasies.
I agree now about the batteries but see my FollowUp above.
FollowupID:
712523
Reply By: GoneTroppo Member (FNQ) - Monday, Jan 03, 2011 at 20:15
Monday, Jan 03, 2011 at 20:15
Thanks everyone for your thoughts and suggestions.
In the morning I'll start isolating the potential culprits.
There is not much in the way of accessories fitted UHF, winch, and diff lock compressor being about it so may not be be so complicated.
The piranha isolator looks to be potentially guilty party.
Hoping it's not the alternator of course.
As someone mentioned the battery compartment when fitted with two batteries is a nightmare of skun knuckles and squashed fingers If I can still type :-) when I'm finished I'll report back with the outcome tomorrow.
Thanks again everyone
Chris
AnswerID:
440605
Reply By: GoneTroppo Member (FNQ) - Tuesday, Jan 04, 2011 at 13:31
Tuesday, Jan 04, 2011 at 13:31
I had a small win, switch in the cab to the kaymar wheel carrier light was on (but switched off at the light itself) turning it off reduced the draw to a steady .20A
I split all the cables on the battery terminal, the draw is from the main battery cable not the one going to the positive side of the piranha. Does this mean the piranha is not guilty?
I have now pulled out and replaced every single fuse still the same reading.
So does this mean it's the alternator if so how do you
check it, or have I missed something else??
Chris
AnswerID:
440675
Follow Up By: Roughasguts - Tuesday, Jan 04, 2011 at 17:13
Tuesday, Jan 04, 2011 at 17:13
To
check if the battery is being charged get your multi meter and
check the battery voltage at the terminals with out the engine running.. should be around 13.2 volts.
Then start the engine and
check the battery voltage should be over 14 plus volts, but at least more than when the engine in not running.
Cheers
FollowupID:
712588
Follow Up By: Member - Murray R (VIC) - Tuesday, Jan 04, 2011 at 20:18
Tuesday, Jan 04, 2011 at 20:18
Chris
A battery drain of .20 amp is still to much, you need to have it below .o6 amp for the battery not to go flat. If the drain is on the main battery cable,you need to isolate each live battery circuit one at a time in the fuse box with the ammeter connected and watch for the drain to disappear. If it doesn't then leave your ammeter in and disconnect the main battery wire from the alternator watching that you don't short the wire or spanner when doing so. If drain goes the alternator is your problem.The .20 amp drain also sounds like the e coil current of a relay feel all the relays on the car and if any are warm its been held on so then you need to find out why.If the cars got AC pull the fuses in the battery box fuse panel and feel the relays also. As you have disconnected the main power lead to the piranha and its still there the piranha is not guilty.Any electrical unit that's drawing .20 amp will feel warm to touch so run your hand over everything. hope this might help.
Murray
FollowupID:
712608