 | Home > Td5 > Continuing battery drain. |
 
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| sonnysullivan Member Since: 09 Sep 2017 Location: bermuda Posts: 4  
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could be a few things. you can make a simple tester with two wires with male spade connectors on one end, bare on the other. pull unswitched fuses and replace with the wires then touch the bare ends together. if you get a spark, then you've got a live circuit. obviously this test will work best in a dimly lit area void of explosive fumes!
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26th Oct 2017 9:37pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324 
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You could use a multimeter too
 . Solved the bowel problem, working on the consonants... |
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27th Oct 2017 10:51am |
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| bluebottle Member Since: 08 May 2015 Location: Not in my Landy enough! Posts: 705 
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Or probably instead.
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27th Oct 2017 12:02pm |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2300  
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Turn off, remove keys etc.
- Disconnect battery wiring from negative terminal - Put multimeter set to DC, about 20 amps between battery negative terminal and disconnected negative wire - Read meter to see whether there is a parasitic current draw - If yes, start pulling fuses and relays out one by one, read the meter before/after removing each fuse/relay - much quicker with a helper! - If multimeter reading stays the same, replace fuse. - If/when multimeter reading indicates a reduced current draw this will identify the circuit that is drawing power, you can then investigate this circuit further edit: this better describes the process, and with pictures! https://www.wikihow.com/Find-a-Parasitic-Battery-Drain |
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27th Oct 2017 12:23pm |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467 
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Is the battery really actually flat? or simply "disconnected" by a dodgy earth cable?? maybe the battery -ve to chassis one loose at the chassis end for example.
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27th Oct 2017 12:37pm |
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| landyman37 Member Since: 22 Jan 2012 Location: west midlands Posts: 153 |
Had the glow plug relay drain the battery once if I remember right the cables by the gearbox had rubbed earthing the relay.
Phil |
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31st Oct 2017 4:59pm |
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| tdidiscoverer Member Since: 15 Nov 2017 Location: Stirlingshire Posts: 10  
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Is there an update as to what the cause was for the battery drain ??
My 2000 TD5 defender is doing exactly the same. It must be something major as it blew a 12 amp fuse in my multimeter when I pulled out the yellow relay beneath the drivers seat ??? |
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15th Nov 2017 9:36pm |
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| tony.g Member Since: 25 Aug 2017 Location: uk Posts: 21 |
I've not got any further with my discharge problem.
Tried all the things mentioned by others but no result. Mine seems to be intermittent, which has me worried incase it's a short somewhere. It hasn't occurred now for at least a couple of weeks but doesn't inspire confidence. Intermittent electrical problems must be the hardest thing to find. 12 amps on yours semms a hell of a lot. |
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16th Nov 2017 7:42am |
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| tdidiscoverer Member Since: 15 Nov 2017 Location: Stirlingshire Posts: 10
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I think it has to be either the glow plug circuit or the alternator that is causing my fault. The battery can flatten in a couple of hours.
I left it parked up last weekend with a full charge and by Monday morning there was only 4.5 volts. I have a twin battery setup and have disconnected the second battery to eliminate that. Keep me posted please if anything else develops with your car. Cheers Richard |
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16th Nov 2017 4:16pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
with it parked up and NO engine running and full charge battery disconnected alternator power cable and pull glow plug relay under drivers seat to eliminate these two
remember reconnect alternator power cable before starting the engine  |
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16th Nov 2017 4:56pm |
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| tdidiscoverer Member Since: 15 Nov 2017 Location: Stirlingshire Posts: 10
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Thanks for the suggestion. I will let you know how it goes.
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16th Nov 2017 9:32pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17374
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Remember when disconnecting the alternator charging lead that it will be live and only protected by a megafuse, you could easily melt a spanner or get a nasty burn if careless.
I would suggest that you also disconnect the control circuits from the alternator since a fault with the rectifier pack could also (I think) cause the battery to discharge. |
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16th Nov 2017 11:23pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
Remember when disconnecting the alternator charging lead that it will be live and only protected by a mega fuse, you could easily melt a spanner or get a nasty burn if careless.
Very Good point about LIVE alternator charging lead ( disconnect battery end first )
mega fuse post 07 defender only disconnect the control circuits TD5 alternator control circuits is feed by two fuse in centre fuse box 15 and 12 for post 2001 TD5 blackwolf thank Last edited by dorsetsmith on 17th Nov 2017 4:34pm. Edited 1 time in total |
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17th Nov 2017 7:58am |
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| tdidiscoverer Member Since: 15 Nov 2017 Location: Stirlingshire Posts: 10
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I have disconnected and isolated the main alternator cable. I cannot pull the plug from the top of the alternator to completely disconnect it.
I have removed the large black relay AMR3773 from under the drivers seat. I am assuming that this is the correct relay because of the size of the terminals. Microcat says that this is a ABS pump relay however my car does not have ABS Now that my multi meter is working again I have 0.047 amps on the battery and 0.024 amps across the 100 amp fuse under the seat. Now wait and see ?? |
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17th Nov 2017 1:28pm |
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