Could the amp meter be connected the wrong way round? does it move towards "C" when the lights are turned on when the motor isn't running? If so, just reverse the connections at the back of the amp meter.

Stuart.


1950 Chevrolet 3100 (occasionally working) truck:https://c2.staticflickr.com/6/5490/30684982201_6dc479d18d_c.jpg
1928 Chevrolet AB National Phaeton: https://c4.staticflickr.com/6/5573/30137792083_42886d30a4_c.jpg
1932 Austin Special Sports: https://c8.staticflickr.com/6/5793/30116567183_1520e67c4d_z.jpg