![]() One of the least invasive ways to connect to a circuit is a breakout. This type of connection might be the best option if a sensor is buried deep inside an engine or a connector is inaccessible. The needle can be spring loaded or screwed down into the wire. Piercing probes perforate the insulation of a wire with a needle. Some back probes have a rounded spade profile that can be used on small diameter wires. Specialty back probes will have a small diameter and create less leverage on the connector. But, back probing with a pin might be your only option. Also, there is no way to know if the pin is damaging the terminal. There is no guarantee of the contact being made between the pin and wire. If there is no grommet, you can slide the pin gently into the insulation. The best way to use these is to slide the pin between the connector housing and weather pack grommet. These can be inserted into the back of a connector to back probe the connection. T-pins and needle probes have been around for a long time. Making the connection in the least invasive way possible is critical to achieving a confirmed diagnosis. Also, the slightest amount of green corrosion or high resistance can set codes.īeing able to capture a signal, voltage or glitch is critical to diagnosing many problems and codes on a vehicle.Ĭonnecting a multimeter or scope to a circuit is sometimes very difficult. The flickering of a test light or dancing of digits on a multimeter could be serial data to command a window down or just a faulty ground. Things have changed.Modern voltages can be three-, five- or 12-volts and they might have a pulse. Every voltage value was 12 volts, and the most sophisticated component might be the ignition module. On the other end of the spectrum are technicians that have zero problems stuffing a blunt multimeter lead into a connector for an ECM.īack in the day, a technician could carry out most electrical diagnostics with just a test light. Some technicians curse t-pins and piercing probes claiming they can damage a wiring harness. Probably one of the most controversial topics among technicians is the probing and piercing wires and connectors. If connecting a resistor to observe the waveform, you may not obtain an accurate measurement especially if the voltage becomes lower due to noise generated from the connector.This oath has become more difficult to follow as vehicles have become more complex. We recommend you to use a current probe for the current waveform observation.Use a non-inductive resistance for the load resistance (Do not use an electronic load instead, otherwise the current cannot be accurately measured.). ![]() To minimize the induction effect, make them into a twisted pair and as short as possible. The resistance calculation accuracy is affected by the inductance of the wiring harnesses and the connection cables.So, the connector’s contact resistance can be accurately measured. ![]() Since the voltage is constant, the current depends on the connector’s contact resistance and the load resistance.
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