My Mk IV Mondeo (2L Diesel 2007) has a completely flat battery - no idea why it has drained, but it seemed to happen over the course of a couple of days.
Unfortunately that does happen. There are some 'conspiracy theories' but probably the best thing to say is that, electrically. the Mondeo is a fairly complex car (as are most these days) and there can be a number of causes.
One thing to keep in mind is that, if that is an original battery, it could be quite down on capacity by now. Or, to put it another way, with the winter coming, it might not have great prospects of surviving through the winter period.
On connection the sidelights started to pulse, so I turned them off. The hazards also began to pulsed and a relay could be heard clicking on and off. I operated the hazard light button, but could not get them to stop pulsing. So I left if for about 20 seconds and the hazards continued to pulse and the relay continued to click. So I gave up trying to charge it.
I can only think that the battery voltage has become so low that various modules are not working correctly, even with the charger connected. How about disconnecting one terminal of the battery, and putting the battery on charge that way, for a long period, and see if the battery recovers?
- MONDEO TXS 2.2 likes this