— Connect digital multimeter negative lead to a reliable ground point on car.
The negative (-) battery terminal is always a good ground point.
Connect digital multimeter positive lead to point in circuit you wish to measure. If a reading is obtained, current is flowing through circuit.
The voltage reading should not deviate more than 1 volt from the voltage at the battery. If the voltage drop is more than this, check for a corroded connector or loose ground wire.
from Battery +
| Fuse box
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