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Battery issues (Fully charged +13v when disconnected. 6v when connected to car.)

TPR999

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Austalia
#1
Hi All

My 2014 Fiesta ST has been off the road for a couple of weeks with a broken overflow hose waiting on replacement. I went out to turn on accessory to check something and it turned on for 30 seconds then all power went out. Couldn't lock it anymore etc

I checked battery while plugged in and it said 6v so I went to charged it and charger says full 13.5V? What's going on here? I plugged it back into the car and sure enough still no response at all from key or start button still.

Any ideas? I have no aftermarket accessories fitted.
 




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