rhyds Posted May 21, 2018 Share Posted May 21, 2018 My boss has a 2010 focus Titanium 1.8 petrol which randomly likes to drain its battery. Today he drove it about 5 miles, parked it on site, moved it around a couple of times and then when he came to drive home tonight it was flat. A quick jump start from my focus got it going. The car also seems to turn on its auto headlamps if the battery is low (even with the switch in the off position), compounding the problem. Now, I have two suspects, one is the fact the battery is a Ford Silver Calcium one (so probably 8 years old) and secondly the radio has been changed for an aftermarket unit (IIRC this can cause the bluetooth unit to stay on and cause a drain?). Am I right in thinking the best thing to try first is a new battery before I try and get the bluetooth module out? Quote Link to comment Share on other sites More sharing options...
kingsblue Posted May 21, 2018 Share Posted May 21, 2018 Does the mileage display stay on after you've locked the car, it should go off after 20 minutes, mine was staying on which eventually drained the battery, the fault was the bluetooth module not shutting down which is behind the glovebox, I just disconnected mine and all was fine. 1 Quote Link to comment Share on other sites More sharing options...
rhyds Posted May 22, 2018 Author Share Posted May 22, 2018 It does seem that the instrument cluster is shutting down correctly after locking the car, so it seems its the battery at fault. Is it a big job to change the battery on a MK2.5? Quote Link to comment Share on other sites More sharing options...
FatHead1979 Posted May 22, 2018 Share Posted May 22, 2018 39 minutes ago, rhyds said: It does seem that the instrument cluster is shutting down correctly after locking the car, so it seems its the battery at fault. Is it a big job to change the battery on a MK2.5? 10 minutes if it's a model where the airbox needs to come out to get access to the battery and 5 minutes if not. Quote Link to comment Share on other sites More sharing options...
StWou7 Posted May 22, 2018 Share Posted May 22, 2018 My Dad had an issue with his Focus constantly draining battery. Turned out to be an issue with the ignition (wasn't a start/stop button but a fixed key type thing) i believe there is quite a common fault with the focus (sorry if im wrong and im sure someone more technical can advise further). Quote Link to comment Share on other sites More sharing options...
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