Multimeter check for leakage 4 ways to check for leakage
Step 1: Remove the negative terminal of the battery.
Step 2: The red pen of the multimeter is inserted into the 20A current jack, and the meter is screwed to DC 20A.
Step 3: Multimeter according to the above chart, the red pen connects to the battery cable, the black pen connects to the battery pile head, the pen can also be connected in reverse.
Step 4: At this time, the multimeter display, is the amount of our leakage
1) current detection method
Detection steps disconnect the ignition switch, remove the negative battery wiring, set the multimeter to the ammeter (20A gear), and then take two wires, the two wires were connected to the end of the multimeter positive and negative pens, the other end were connected to the negative terminal and negative wiring, observe the ammeter value. The measured current value and maintenance information against whether the normal range.
If the measured current value is too large, the vehicle has a leakage fault. Troubleshooting methods will be pulled off the fuse wire one by one, to see the value of the change.
When pulling down a fuse when the current value becomes smaller, the leakage part is through the fuse of the circuit or appliance. Determine the scope of the fault. You can check the electric control home circuit diagram or view the line direction. Follow the line to find the damaged parts for repair.
If you pull all the fuse, the ammeter value is still very large, then the point of failure in the fuse before the line, should focus on checking the fuse before the line with or without a short-circuit hitch phenomenon.
(2) resistance detection method
Detection steps to disconnect the ignition switch, remove the negative battery wiring. Use a multimeter, the black pen to the positive terminal of the battery. Red pen on the iron. Adjust it to the ohm file, so as to measure the total resistance of the car: if the resistance value is very large, it is normal, no leakage phenomenon.
If the display is a few ohms or dozens of ohms. It is not normal, there is a short-circuit phenomenon.
Troubleshooting methods will be pulled off the fuse wire one by one, observe the changes. When pulling down a fuse when the pointer is no longer rotating, the point of failure is through this fuse circuit or appliance.
With the current detection method ~ the same. By consulting the electric control home circuit diagram or view the line direction, along the line to find the damaged parts for repair.
(3) empirical detection method
Detection steps to disconnect the ignition switch, remove the negative battery wiring, and then touch the wiring with the negative battery post, observe the spark intensity. The stronger the spark, the more serious the leakage phenomenon.
Troubleshooting method if the spark is weak, it means that there is a small current, should focus on checking the interior lights, luggage compartment lights, etc. Whether there is a false connection often bright phenomenon; if the spark is strong, it means that there is a large current, should focus on checking whether there are electrical appliances in the work all the time or whether the line is broken hitch phenomenon.
