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9th May 2019, 15:59 | #1 |
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Battery parasitic drain
Hi whilst I'm still waiting for an oil cooler my battery seems to be going flat regulary the alternator is charging at 14.5 volt and with the heated rear window on drops to 13.8 but rises back to 14.5 volt when I rev it, the battery is only 2 month old and that was reading 12.5 volt when I removed the negative lead over night to see if it had dropped although today it was at 12.2 volt. I have tested the amperage by putting a meter between negative lead and negative post of the battery and it reads 0.25 of an amp although I got it down to 0.17 after holding leads tighter on battery lead and terminal is this an acceptable reading or too high.
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9th May 2019, 17:26 | #2 |
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Are these readings with the car locked and asleep? 170ma is much too high if its the case . My LR Discovery 3 drain is 10ma after about 1 1/2 hrs after locking
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9th May 2019, 18:35 | #3 |
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With everything turned off doors shut after about 20 minute
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9th May 2019, 21:47 | #4 |
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If your battery is discharging over night with the negative lead removed your battery is a dud.---
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9th May 2019, 21:55 | #5 |
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I had it disconnected for 2 nights the next day it was 12.7v day after it was 12.2v
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10th May 2019, 10:57 | #6 | |
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Quote:
You definitely need to take the battery back to where you bought it from to get a replacement under guarantee.-- |
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10th May 2019, 12:17 | #7 |
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Thank you both for your help I've exchanged the battery for a new one I also got a test probe and checking the fuse box most lit up green negative with everything turned off but fuse 1 5 and 9 I think lit up red positive I had the passenger door open but turned the interior lights off
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10th May 2019, 13:35 | #8 | |
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10th May 2019, 16:24 | #9 |
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At the moment it keeps fluttering from 0.20 to 0.25 it's been on for about 20 minute I will give it another 20 minute the battery is a Banner red power I've left it about 45 minute the reading dropped fluctuating between 0.13-0.14 amp
Last edited by racing green rover; 10th May 2019 at 17:00.. |
10th May 2019, 17:25 | #10 | |
This is my second home
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Quote:
What car stereo system do you have fitted, and do you have a dash cam? A faulty alternator with a bad diode can drain a battery, normally the battery would go flat overnight if this was the case. |
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