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What is the troubleshooting method for a complete vehicle power failure?

1 Answers
GrahamLee
07/29/25 9:09pm
Automotive complete vehicle power failure troubleshooting method: 1. Select an appropriate current clamp, connect the output end to the diagnostic instrument, and after matching, bring up the current detection interface; 2. Confirm the connection direction of the positive and negative poles of the current clamp, the current arrow should be consistent with the actual current direction, ensuring the current clamp is fully closed; 3. After confirming the correct connection of the equipment, turn off the vehicle power and lock it, wait for the vehicle to enter sleep mode, then detect the static current of the entire vehicle. If the static current is too high or shows significant fluctuations, it indicates a leakage phenomenon in the vehicle. Most cases of complete vehicle power failure are caused by leakage, which can easily burn out fuses. Therefore, if the main fuse is found to be burnt out, do not replace it with a higher ampere fuse. Instead, take the vehicle to a repair shop to check for leakage to avoid damage to more vehicle electrical components.
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