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I've had this before with a really dead battery. It's like it was just absorbing all the power from the other battery. The only way we could get the engine running was to disconnect the dead battery completely. Then it started OK, jumped off the other battery, but as soon as you disconnected the jump leads (bit tricky to drive home with them still attached) the output voltage from the generator went mental without a battery to charge.
Brommers
Ok - thanks both, I'll pick one up.
I thought as much, the only thing that made me wonder was not being able to jump start as I thought that this meant you're technically using the other cars battery...