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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 509  
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I have some experience with the ford twin battery set up in the ford transit..it may be similar..
What I remember is that it's a great set up, but the aux or second battery pretty well takes care of most of the vehicle systems and if that is not well charged it can cause all manner of strange behaviour..so the first thing I'd make sure of is that your aux battery is in fact in good condition..ie charged and still has good capacity as that's what is likely running the alarm central locking and everything else that consumes power when the engine isn't running.. On the transits I think the first indication of a failing aux battery was strange behaviour of the remote fob.. |
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19th Aug 2024 7:34pm |
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| s55shh Member Since: 30 Dec 2019 Location: staffs Posts: 192
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my ECU was spiked when it went flat in bodyshop. Obviously they claimed it was nothing to do with them jump starting it. I ended up having the ECU recoded so it would work but without remote locking and used cat 1 alarm to do the central locking instead
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19th Aug 2024 7:54pm |
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| Gonk Member Since: 18 Aug 2024 Location: Baldivis, WA Posts: 3 
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The aux battery charges when the engine is running. It's mostly on 100%, maybe drops a percent when I leave it overnight.
It's a bit of a ball ache. I should have taken a photo of the setup before I took the battery out. I'll try swapping some of the same colour leads around from aux to main battery. It seems coincidental that this started happening after I re-installed batteries. One of the positive leads does get quite hot when the aux battery is charging, cools down when on 100%. Lead has an in-line fuse, so hoping it will blow before lead melts, unless fuse it too high. Also, I have a compressor under the driver's seat which also stopped working on battery re-installation. At a stretch, I could find out where the dual battery set-up was originally done and take it back there if not too far away. Thanks for your input. It gives me food for thought. |
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20th Aug 2024 12:48pm |
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| Gonk Member Since: 18 Aug 2024 Location: Baldivis, WA Posts: 3
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Update;
Compressor works again, aux. battery charging wire and fuse was changed as rating was too small. But, it's come to the crunch folks. I need to take the Defender to a specialist to get the starting issue fixed. Does anyone have any suggestions for such a person in Western Australia? I am 45km south of Perth CBD. I'm pretty sure it's an electrical problem regarding the ECU/alarm/immobiliser/central locking or thereabouts. I'm no expert so that is just an educated guess. Thanks in advance. Gonk |
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7th Oct 2024 1:10pm |
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| skidrov Member Since: 06 Oct 2013 Location: Melbourne Posts: 55 
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A couple of suggestions.
If you have not already, I would suggest joining https://www.aulro.com/afvb/index.php?. There is always excellent advice here, but likewise on the AULRO forum, and closer to home. And then following on from that: a regular contributor is Daz from https://www.aztech4x4.com.au/. I am in Melbourne, and so have not used his shop, but he is (more) in your part of the world. I did note you're 45 km from Perth, but he's closer than the UK  . |
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8th Oct 2024 12:17am |
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| Julie Member Since: 07 Oct 2017 Location: Nantes Posts: 472  
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Have you ever tried to remove your AUX battery. Then install new 12V 90 Ah battery as is factory setting. Lead acid. I too have a dual battery setup but they're linked by a DC charger. Lead Acid factory setup and an AUX battery with différent specs |
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23rd Oct 2024 7:15pm |
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