A system for detecting anomalies in electrical wiring in a truck trailer, comprising: a master current measuring circuit configured to measure a master current indicating current received from a truck tractor, the master current measuring circuit electrically connected upstream from a power distribution circuit of the trailer; one or more slave current measuring circuits electrically connected to the power distribution circuit downstream from the master current measuring circuit and upstream from one or more trailer components electrically connected to the power distribution circuit, wherein the slave current measuring circuits are: a) linked to the master current measuring circuit via an internal communications link; b) electrically connected to individual trailer components of the one or more trailer components; and c) configured to measure a slave current indicating current passing through the slave current measuring circuit; wherein the master current measuring circuit is configured to: command the one or more slave current measuring circuits to separately measure the slave current; measure the master current; and generate a notification of a circuit anomaly when a difference between the master current level and the slave current of one or more individual slaves is greater than a predetermined threshold value, wherein the one or more slave current measuring circuits comprises: a switching device configured to selectively divert power from an individual branch of the power distribution circuit to a test load; a slave shunt resistor electrically connected in series downstream from the test load; and a slave microcontroller with a first input electrically connected to a first end of the slave shunt resistor, and a second input electrically connected to a second end of the slave shunt resistor; and wherein the slave microcontroller is configured to measure current passing through the slave shunt resistor. a master current measuring circuit configured to measure a master current indicating current received from a truck tractor, the master current measuring circuit electrically connected upstream from a power distribution circuit of the trailer; one or more slave current measuring circuits electrically connected to the power distribution circuit downstream from the master current measuring circuit and upstream from one or more trailer components electrically connected to the power distribution circuit, wherein the slave current measuring circuits are: a) linked to the master current measuring circuit via an internal communications link; b) electrically connected to individual trailer components of the one or more trailer components; and c) configured to measure a slave current indicating current passing through the slave current measuring circuit; a) linked to the master current measuring circuit via an internal communications link; b) electrically connected to individual trailer components of the one or more trailer components; and c) configured to measure a slave current indicating current passing through the slave current measuring circuit; wherein the master current measuring circuit is configured to: command the one or more slave current measuring circuits to separately measure the slave current; measure the master current; and generate a notification of a circuit anomaly when a difference between the master current level and the slave current of one or more individual slaves is greater than a predetermined threshold value, command the one or more slave current measuring circuits to separately measure the slave current; measure the master current; and generate a notification of a circuit anomaly when a difference between the master current level and the slave current of one or more individual slaves is greater than a predetermined threshold value, wherein the one or more slave current measuring circuits comprises: a switching device configured to selectively divert power from an individual branch of the power distribution circuit to a test load; a slave shunt resistor electrically connected in series downstream from the test load; and a slave microcontroller with a first input electrically connected to a first end of the slave shunt resistor, and a second input electrically connected to a second end of the slave shunt resistor; and a switching device configured to selectively divert power from an individual branch of the power distribution circuit to a test load; a slave shunt resistor electrically connected in series downstream from the test load; and a slave microcontroller with a first input electrically connected to a first end of the slave shunt resistor, and a second input electrically connected to a second end of the slave shunt resistor; and wherein the slave microcontroller is configured to measure current passing through the slave shunt resistor.