This is what I have done for my AN650 mirror turn signal. Replace the original turn signal light bulb mount by the brake light bulb mount (with the brake light bulb of course). Now u have 3 wires instead of 2 from the turn signal light bulb mount. Find out which wire is for the running light, then connect this live wire and the earth wire to the corresponding wires of head light, so that whenever the head light is turned on, the running light of the mirror turn signal light is lit too. Then connect the rest live wire of the modified mirror turn signal light to the live wire of the original turn signal source. This simple DIY works very well, I have it running for over 6 months without any problem (even with my electric fold mirrors). But before you do the same, please make sure your country's regulation allow such modification.