Hi I have a silver calcium battery fitted, I done this at the same time as I got this Alternator fitted. The RAC tested the plug and there was charge come from the battery to the Alternator. But he was unable to check the other two wires. When I got the car check over the other month by Auto Electric nothing showed up. other the the alternator that I had at the time sending out too high of voltage. Just need to get thing sorted, As the lad said it is showing up as the same fault and the RAC, can refuse to come out as it would look as if I am not doing anything with the alternator fault.