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Wiz Au
X-TRAIL ENTHUSIAST
Date Registered: 06-2017
Location: Canberra, ACT
TOTAL POSTS: 185
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Re: 2006 T30 Battery gets very low after several days/week of non use
Any LED light upgrades in the cabin interior or door lights? Thinking it might be a faulty LED / short / wrong polarity (which you wouldn't get with an incandescent)?
Try removing all the globes, and see if you still get that 0.07A draw.
But really, 0.07 amp (70 milliamps) draw shouldn't make a 50-60Ah battery go flat in a week. That's less than 12Ah a week! Two weeks, yes, but not a few days/1 week. Come to think of it, if a battery in a car went flat in two weeks, I'd think there was a problem.
I once worked on a car (Audi) that reset the ECU every night at around 1am I think, if the engine wasn't running. We discovered this because the battery was going bad, and the alarm would go off every night for "no reason".
I wonder if it's something like that, which you wouldn't see unless you log the current draw continuously, or at least overnight. That at some point there's a big spike in the current draw for some reason.
The 'cheap' way to do that if you don't have a login meter, is to setup the meter with a video camera and record it, and then play the video back in Fast Forward the next day to see if the readings change at all over time.
--- 2004 T30 series II, Ti (now sold)
JRR50 Pathfinder, QD32ETi Turbo Diesel, with 'lots o fruit'.
2012 Jeep Cherokee KK CRD Limited is current ride.
Will be looking for a white or silver 2011-2013 T31 TL (Diesel) to "pimp out".
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10/Oct/2017, 4:14 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re:
I'd troubleshoot the immobiliser as well, a s faulty immobiliser would cause abnormal battery drain, so maybe try disconnecting the fuse for it and see what happens.
I presume you have already checked that the alternator is functioning correctly? If not, test that too, as bad diodes in the alternator can cause battery drain as well.
Last edited by jalalski, 11/Oct/2017, 7:07 am
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11/Oct/2017, 7:04 am
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: 2006 T30 Battery gets very low after several days/week of non use
Did you check the charging voltage in both DC and AC ?
If there is a faulty diode it could let AC through and this would easily ruin a battery.
Also, unplug your relays one at a time to see if the current drain drops as one of them might be sticking on.
Have you replaced your internal lamps with LED ?
Since they are controlled by the Timer Module which switches with electronics, there could be a slight drain as the LEDs draw a small current which does not allow the output transister to turn off completely. You can check this to see if there is a faint glow at night with all the doors closed.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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11/Oct/2017, 9:07 am
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: 2006 T30 Battery gets very low after several days/week of non use
There should be NO AC from the alternator as I understand it.
I would expect it to be either a full-wave rectifier bridge or worst case a half-wave rectifier bridge and I wouldn't expect a multimeter to sense output from either as AC because there would be no negative voltage swing.
There is no AC ripple spec mentioned in the service manual but it does mention a charging voltage from the alternator of 14.1 - 14.7 so you could check that to make sure you are also not overcharging the battery.
I'll measure mine tonight to see if there is any AC with my Fluke meter.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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11/Oct/2017, 10:16 am
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texta
X-TRAIL NEWBIE
Date Registered: 10-2017
TOTAL POSTS: 8
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Re: 2006 T30 Battery gets very low after several days/week of non use
Thanks again Revhead Kev for your reply.
I just made contact with a VERY experienced and Knowledgeable auto electrician in Sydney - where I used to live - and here are the main points I learned/had confirmed...
First - My charging voltage was not high enough for the new calcium batteries. As you (Kev) alluded to, it should be 14.1-14.7V. Mine was at 13.8V. I did not know about this charging voltage for new batteries. Ignorance on my part.
Second - the 30V AC is still present even with the engine switched off. Apparently this is probably from a low quality inverter for some dash circuit supplying higher than 12V supply to various components. Nothing to be done here, apparently it is not unusual. Obviously though it is not coming from the alternator since it is still present when ignition is switched off.
Third - Confirmed, there is nothing too unusual about 70 mA drain at rest.
Fourth - He suggested that one of the two wires going into the plug on top of the alternator would more than likely be a battery voltage sensing wire and that the sensing circuit was more than likely faulty limiting the charge voltage to 13.8V. (The sensing circuit is thinking the voltage is too high).
There are two wires here, one is a yellow with a red trace the other is a green with a black trace. I did some tests and the green one is in fact the sensing wire. On his recommendation this wire was cut and the engine started. The charge voltage jumped to 14.8V (probably the maximum the regulator can do). Now, this is where experience counts, he simply suggested to place a diode (Anode to battery, cathode to alternator) in line with this wire to induce an artificial extra 0.6V drop to the sensing circuit causing it increase it's output by a similar amount.
This was done and the battery is now charging around - you guessed it, 14.3/14.4 volts!
I am yet to see what happens as far as the original problem of the battery losing charge over time does, but I think it has been a good start.
Thank you to everyone who has helped here. I hope these findings can help some more people in the future not to just throw away their old alternator but try something like this instead and save hundreds of dollars in the process.
I will re-post the findings in a couple of weeks as to how things are looking for those who are interested.
All the best and thanks again to you all.
Graham - Semaphore South Australia. : - )
Last edited by texta, 11/Oct/2017, 12:30 pm
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11/Oct/2017, 11:48 am
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