Remove the caps or connectors to the glow plugs. I actually disassembled the relay that was in my truck for 6+ years there was barely any signs of wear. All you do is connect two small wires and mount the push button switch in the cab in a convenient spot. To do this, turn the multimeter on, and set it to read in Ohms. If voltage is greater than 10.
Also plan on replacing the glow plug harnesses too, since removal of them pretty much mandates replacement. If one is bad, the others are not far behind, and replacing all of them is suggested for this reason. If the truck is older than 88 only jumper for 5 seconds. To create this article, 16 people, some anonymous, worked to edit and improve it over time. Step 3: Disconnect the glow plug wires.
It will just crank and blow white smoke unburned fuel vapor out of the tailpipe. Probably is the alt since I am trying to save money to go for a trip soon. Finally, subtract the result you wrote down earlier from the glow plug's reading to determine its actual reading. Find resistance value of your multimeter. This puts unnecessary wear and tear on the glow plugs, the relay, and your battery. With the key on, engine off, measure voltage between center terminal of glow plug shunt and battery ground.
Never replace a single plug. It got to the point where it just wouldn't start at any outside temp. I went to the local dealer and he told me to check with AutoZone or somebody like that. Since there is no residual heat in a cold engine, some means of supplemental heat must be provided to make cold starting easier, especially when the outside temperature drops below freezing. I now believe a large part of the starting problem was the glow plugs were not getting the juice they needed to heat properly. Refer to your shop manual to determine the test specs for your vehicle.
Then the other battery terminal to the cap of the glow plug. There is usually a cover or cap over the glow plugs. Remove the connecting supply lead then connect one terminal any to the metal nearby and the other to the top of each glow plug in turn. I then checked the battery cable that was running from the relay to the starter relay and found a very bad connection at the started relay, it had been covered with electrical tape and looked good until I took the tape off. Step 9: Repeat for other glow plugs.
A shorted circuit or low-resistance glow plug s on the opposite bank could also be the cause. Once the multimeter is set to read in Ohms, touch the two leads of the multimeter together and examine the resistance reading that is displayed. Take the positive lead of your multimeter and touch it to the terminal on your glow plug. With both leads touching the terminals, record the resistance reading that is indicated on the multimeter. Stopped at a CarQuest and they say it is available from a dealer only. There are two versions of the system. Much longer will burn out the plugs.
They make a tool to pop the connectors off - is it worth getting and if so where would you find one? Article Summary To test glow plugs, start by getting a multimeter and setting it to ohms. If it see too low a current draw, it sets a trouble codes P0671 — P0678. A digital multimeter shows the exact number result of the test. The old solenoid lugs were scored and burned like they had had a bad connection for years. An open in all glow plug circuits, the glow plug relay, glow plugs, fusible links or all three monitoring circuits could be the possible causes. Warranty will not be extended to failures caused by incorrect installation or application, modification, contamination, negligence or abuse.
Place the negative lead of your multimeter onto the negative terminal of the battery, and the positive lead onto the positive terminal. Protect your truck against hard start and no start conditions with the Dorman Glow Plug Harness. The multimeter uses black negative and red positive leads to test electrical currency and resistance. While the multimeter can seem daunting because of its many numbers and dials, you only need to use one setting for this test. California System differences The California system operates in a similar fashion but uses a module to switch power to the glow plugs instead of a relay.
Digital multimeters have a difficult time measuring current that is constantly changing. A faulty glow plug should measure considerable outside this range, up to infinity indicating an open circuit. This gas is to reduce the deposits from the electrical arcing inside the relay. For use on engine serial numbers 94581 and beyond Huntsville built. Step 5: Touch the positive terminal.
Are all readings equal and less than 2 ohms? The only good way I know of to remove the harness without destroying it is to remove the rocker box with it still attached and push it out from the inside. Hard Starting Diagnostics If you suspect a problem with the glow plug system, start here: 1. Are all readings within 2 ohms of each other? So the wattage needs to be quite high. Motorcraft parts are manufactured to stringent specifications, and have undergone extensive testing to provide you with the same fit, finish and function as the factory equipped parts on your Powerstroke. If any of the glow plugs fail the test, it is recommended that the entire set be replaced. Attach the negative lead onto one of these bolts for grounding. The entire glow plug cycle primary and secondary will last a maximum 120 seconds, not including any post-cycle activation that occurs once the engine has been started.