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pauljoanss

Battery Light

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2007 1.8 TDCI

Battey light on approx 90% of the time. Voltage measured at 11.8 when engine off and 13.8 when engine running and light on.

It appears the battery is charging so why us the light showing?

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11.8v is a dead batery.
It should be 12v+ at rest and about 14.4v when running.

Sent from my SM-G930F using Tapatalk

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37 minutes ago, pauljoanss said:

It appears the battery is charging so why us the light showing?

The light is not a simple alternator working light. It is under the control of the ECU, which can monitor and control the alternator output. If the battery is high resistance and not drawing much charge, the ECU can probably detect this, and flag an error. In that case there will be ripple from the alternator on the main 12v supply, that could make the charge voltage read lower than normal (13.8 vs 14.2 to 14.4).

One test would be to use a charger with current and voltage indication. If the battery voltage jumps quickly from 11.8v to over 13.5v without drawing a huge current, then it is, as Clive says, defo duff.

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