With a loose connection, the battery is unable to supply the necessary current to sudden hi-wattage demands of accessories such as the headlights high beams. Loose connection problem may cause momentary blacking out of the dashboard, which means the safety features of the car are also momentarily compromised while rebooting (the electronic-assisted power steering, in particular, will be unavailable).
The video was taken with our EcoSport in mid-2019, showing the dashboard shutting down as soon as the high beams are switched on (leaving the car in-gear will automatically re-start the car). This issue was later found out and verified to be due to a corrosion on the positive battery terminal. Cleaning the terminal fixed the problem. The battery continued to serve for a few more months (with the issue fixed and never to recur) but was later replaced as part of a regular maintenance schedule. Always check the terminals for any possible leaks as corrosion is one of the main reasons for a faulty battery terminal connection.
Related link: EcoSport Battery Replaced After 2.5 Years
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ECOSPORT DIY SERIES
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© Anthony Urbano (Manila, Philippines)