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Here I will show you how to troubleshoot the relay and test the relay. (Now with values and measuring points in the circuit diagram) Target values of a relay in the automotive sector: Relay coil terminal 86 to 85 = 40 -120 ohms Relay switching contact terminal 30 to 87 = 0.0 ohms If you measure a value in the kiloohm range on the relay coil, the coil is also interrupted. However, your relay then has a quenching resistor built in and this is always around 1 kiloohm. The quenching resistor quenches the high voltage (around 1500 volts) that is induced in the coil when the magnetic field collapses. Important for the 1st year of apprenticeship, GP1, GP2 and master