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Mike, VW Technician
Category: Volkswagen
Satisfied Customers: 39198
Experience:  Tech Expert
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my 1.4 Lupo was left stored for 6 weeks (battery disconnected,

Resolved Question:

my 1.4 Lupo was left stored for 6 weeks (battery disconnected, and was fine on return), but battery now discharges completely over 2 days of none use. The secondary red terminal on the battery shows a permanent discharge. What could be the cause?
Submitted: 2 years ago.
Category: Volkswagen
Expert:  Shantal-Mod replied 2 years ago.

I'm Shantal and I'm a moderator for this topic.

We have been working with the Experts to try to help you with your question. Sometimes it may take a bit of time to find the right fit.

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Expert:  Mike replied 2 years ago.
Hello and Welcome -

My name is XXXXX XXXXX Im happy to help you ...

Can I just ask / check with you that the battery has been properly / pro tested with pro equipment to be 100 % sure of its condition...?.,.. because this is the usual fault ---

Rgds, MIKE......................................

Customer: replied 2 years ago.

Hello Mike, yes the battery has been checked by ATS in bridport. rgds Peter

Expert:  Mike replied 2 years ago.
Hello again Peter -

Thank you for your reply and info..

Ok - assuming that the battery is indeed ok - then you must have a parasitic drain causing this..

Such can be hard to find to be perfectly honest with you - It usually is a sticking relay... a faulty "computer" - module...and so on.. It can then even be something simple such as a boot light staying on ( unbeknown to you ) because of a faulty switch etc..

What we suggest in these circumstances is to go down the easy route first - so remove the bulb from the boot ( and glove box if fitted ) and see if the drain goes off... if it does- you have a faulty circuit switch on whichever is causing it of the two.

If its not that - then unplug the alternator fully- as that if it has faulty diodes will cause this - and re check.

If its not that - then you are now into possible relays / computers - and even the radio system as a suspect. The latter is quite common.. but at this stage, you are going to need to go down the proper route to find such a drain and that is to use an amp meter in the battery circuit - and then remove each fuse, one at a time - while checking the meter to see which one causes the drain to die away - at which point - you have your faulty circuit... then you need to ID whats on that given circuit - and then isolate the individual equipments to find the exact cause of the fault...

So thats the way forward on this Peter... Im sorry there is not a "it will be this or that " answer to this one - I have gone through it in the easiest way first for you -- thats the way to work through it to get this sorted for you now....

Let me know if you need anything else at all -

Kind Rgds - MIKE.

...>> >> > Meantime..............Please do click on the "OK/ Excellent ratings" for me as that's how Im credited for helping you - Thank you in advance for that...

You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..

Rgds, MIKE.

Mike, VW Technician
Category: Volkswagen
Satisfied Customers: 39198
Experience: Tech Expert
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