Ford Fiesta battery discharges over 7 days

Car: Ford Fiesta
Variant: 1.0 ecoboost
Model Year: 2017

Categories: Electrics, ECU, Warnings & Lights

If I dont use my car for seven days the battery is flat. 12 mile drive on Thursday battery was only reading 12.3 volts when I stopped. Battery checked out good, alternator good. Today, Saturday battery 12.1. Auto electritian says I have a drain of 28mv. with the fuse box in the engine bay disconnected, alternator disconnected, and all live fuses removed from fuse box passenger footwell, the discharge is still there. Any suggestions?

Posted: Nov 16, 2024 (1 day ago)

Edward Shotton

Points: 1

Why cant the auto electrician find the cause , that's his job ?

Posted Nov 16, 2024 (1 day ago)

whittingehame

Points: 38,657

He came straight out and was short for time, He was with me for nearly two hours and only charged £60. He has gone away to have a rethink as to what it can be. If the discharge does not go through any fuses then I think we will be scratching our heads.

Posted Nov 16, 2024 (1 day ago)

Edward Shotton

Points: 1

Have you LOAD tested your battery ? If original and not fully charged / weak cells , it wont hold a charge . Another thing I've come across on some , if the key remote is kept in house or anywhere in range of car it can still transmit and not allow certain systems / modules to shut down , draining battery.

Posted Nov 16, 2024 (23 hours ago) Edited on Nov 16, 2024 (23 hours ago)

whittingehame

Points: 38,657

Thanks for your reply. The battery has been load tested twice and found to be good. How far should the keys be from the car? We went on holiday and left the car at the airport for ten days and did not have a problem.

Posted Nov 16, 2024 (22 hours ago) Edited on Nov 16, 2024 (22 hours ago)

Edward Shotton

Points: 1

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Ford Fiesta battery discharges over 7 days

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