Indicator Problem - Sprint 900

I have just recently put a crk conversion kit on a Sprint 900. As part of the conversion smaller indicators than standard have been fitted. Everything works ok when the bike is not in gear. However, when in gear, indicating right cuts the engine. I have tried obvious things, such as broken wires, bad earths etc. I have also replaced the indicator regulator but still the problem exists. This only happens when the bike is in gear. Any suggestions please?