No combination allows the Ctek 5 to charge via the trailer socket. I've seen this model of charger just shut down on a very flat battery when the regular 'non-smart' charger will just charge it. So it could be oxidised connectors/old wiring or the Ctek not liking the load it's detecting. I'm going to find an old style charger and try that before giving up on charging through the trailer socket. Car may be on the drive for a while! Key won't open the lock manually. Wondering if I inadvertently 'superlocked' the car somehow on Thursday when I was messing with the weak signal on the fob?
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