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Mickey mcc

Battery keep going flat over night

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Hi im new to forum brought a 55reg 3dr 1.4focus late last year nov parked it up till 2 wks ago drove it round monday to Saturday no problem then went to start it Saturday evening and nothing battery dead no battery  warning lights or any other dash lights jump started it got home flat again sunday morning got new battery Monday to Saturday ok then battery dead again when it was parked up left it for a few days may b a wk and no problem starting then been driveing it around and this can any body tell me what it could b thanks

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20 hours ago, Mickey mcc said:

got new battery Monday to Saturday ok then battery dead again when it was parked up left it for a few days may b a wk

Diagnosing battery drain problems, especially if a bit intermittent can be a pig of a job. It first needs some current measuring equipment, a standard multimeter will do, but it not easy to use with it's typical 10A maximum range. You need to connect it, but have it shorted out, then lock the car, then remove the short, or something like that. To narrow down the problem usually means systematically removing fuses and relays. So some electrical experience & the wiring diagram (which is available on this site) is probably needed. The wiring diagram is about 130 big pages!

But the starting point is any aftermarket add-ons, especially alarms or radios, music players, nav equipment etc. Remove or disconnect anything like that first off.

If possible, put it on charge when you can. If the charger has a current meter, this will greatly help in identifying current drains. It is possible to disconnect the battery -ve terminal once the charger is attached, and provided heavy loads like locking motors & windows are not triggered, is will supply and monitor the standby current draw. (This will only work if the charger is a fully regulated type, not some old transformer & rectifier type. Most modern chargers will be ok.)

A charger will of course also prevent flattening the battery, which is something that is really bad for all car batteries, and is to be avoided as much as possible.

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