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To check the coils you need to disconnect them then take a primary and a secondary reading with an ohm meter I don't know the exact figures but the primary which is taken between the 2 thin leads should be about 4-7 ohms and the secondary taken between the 2 ht leads should be somewhere between about 25000 to 35000 ohms if you check both of them they should be roughly the same , usulay if the coil is knackered you will have an open circuit between one of them.