• Jump it and see if it happens again tomorrow. If so, run a voltage test to see if anything is drawing extra current and to make sure the alternator is charging the battery. If neither of those, then probably new battery time. How old is the battery?

  • When you say voltage test, is there something I can do to test if a module is pulling power it shouldn't?

    Battery was near enough 14v with engine running, so alternator looks ok. Drove around for 90 mins or so and once turned off I got 12.7v.

    Also ran diagnostics with a Carly and once I'd cleared all the original low-voltage errors, nothing new came up (during and after driving).

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