Vehicle power generation is too low or power is insufficient. Shanghai donghui instrument shows dy 1 1 as the battery indicator. When the power generation of the vehicle is too low or the power is insufficient, the indicator light will light up. Use a multimeter to check whether the power generation of the battery is sufficient. If not, you need to check the circuit or replace the generator. Shanghai Donghui Instrument Co., Ltd. was established in 2003, located in Shanghai, and is an enterprise mainly engaged in instrument manufacturing.