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A Yanan SX2150K car. The car burns the fuse when it hits the left turn light. Failure check: first, open the danger alarm switch and fuse instantly. After installing the new fuse, turn on the right turn light switch, and the flicker on the right side of the lamp is normal. When the left turn signal is turned on again, the fuse will be burned immediately, indicating that the fault is on the left turn signal. Remove the left front steering lampshade, check the lamp holder and its line, and find no abnormal conditions. Check the front turn light, lamp holder and lampholder, and find no abnormal phenomena. Open the rear rear tail lamp assembly, pull out the parallel connection plug, find corrosion phenomenon, use fine sand paper to wipe clean, install the test, the fault is temporarily eliminated, but after a period of time, the above failure phenomenon appears again. Pull out the front steering lights, and do not burn any insurance, indicating that the fault is in the lamp holder. Carefully check the front and rear lamp holders, lamp holders and connecting lines of the steering lights, and find that the power of the front turn lamp bulbs is slightly larger. Replace the same shape bulb, install the fuse, turn on the steering light, and blow the fuse after a while, indicating that the trouble still exists. Check the left rear steering light, unplug the power cord, turn on the left turn light switch, the lights flicker too fast, and the fuse will not burn. Indicate that the fault is in the rear tail lamp assembly. Check the rear side lamp carefully and find that there is too much oxide inside the parallel wire, plug and insert. Troubleshooting: decomposing the taillight assembly, grinding the oxide on the plug and socket connector piece by sandpaper, cleaning it up and reloading it, and the failure will disappear. Failure analysis: as the car wash is not covered with plastic film electrical equipment, resulting in taillight assembly rinse water. After a period of corrosion of the wire and terminal corrosion produced white oxide, these substances have poor electrical conductivity, the electrical resistance of the circuit is increased, and the rear lamp assembly has a large wire resistance in common, and the light bulb is not used to match the original model when replacing the bulb. Load. Therefore, the above failure phenomenon appears.