How GFCIs Work A good ground is especially important with engines that are electronically fuel-injected or have some … The outlet works. I’ve read some places that even though it’s “open ground”, because it’s a GFCI it’s okay… but I just don’t want anyone to get electrocuted. The more resistance, the harder it is for a current to pass through the conductor. Electrical resistance is literally the difficulty that electricity has to get through a component, called a conductor. Set your multimeter to 20 volts DC. Touch one probe to the end of the ground wire and the other probe to the appliance electrical post. In many cases the open ground on one outlet is the result of a disconnected wire at another outlet. Check both one with an open ground and one with an okay ground. Again, check one with an open ground and one with an okay ground. Do you have grounding wires attached to the outlets? It … If not, continue to the next test. Testing for Ground on 2-Slot Polarized Receptacles . Is the test light on? Did the test light illuminate for each cavity? To check short to ground with a multimeter, you need to measure resistance. Once you verify that you have power, remove the probe from the longer slot and touch it to the screw in the center of the cover plate. Just like that, your “open ground” issue has been rectified. Turn the ignition off. To check if an outlet is grounded, it is recommended that you use an outlet tester, which you can purchase from an electrical supply or hardware store. In the master bedroom on one wall there are two receptacle that when tested shows “open ground”, I have replaced the receptacle on both (with new tamperproof receptacles) and while doing that checked to ensure there was a “ground” wire connected from the receptacle to the box (see image below). Once that is done, the outlet tester will show the outlet has been repaired. If an “open ground” is found, you want to connect the bare wire found behind the outlet, known as the “ground wire,” to the outlet by hooking it onto it. Where was this grounding wire? A surge protector plugged into an open ground outlet is not able to actively protect the devices plugged into it, as it utilizes the outlet's wiring to reroute an overload. In homes where all the outlets were installed with a ground, any failure of the ground must be corrected by replacing the failing outlet, or replacing and/or reconnecting the ground wire. Prior to about 15 years ago, the basic methodology for ground testing remained fundamentally unchanged since it was originally devised in the early 20th century. Check the voltage reading. The test/reset function on the outlet seems to work (I hit test and there’s no power, I hit reset and the power is back, but shows as “open ground”). If the tester lights up or registers, the outlet is grounded and wired correctly. Disconnect the ECM harness connectors. Turn the ignition on. To test a DC circuit ground wire, remove it from the appliance to which it is connected, such as the radio, heater fan or cigarette lighter. Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output circuit in ECM harness connector. Yes –> Go To 2 No –> Repair the ECM Ground circuit(s) for an open. Also, I'm unclear about your statement, "The grounding wire was connected to the old recepticle and I reconnected it." Many vehicles had an engine to ground strap from the factory; it's a good idea to check the stock strap and replace it if it is damaged or frayed.