SOURCE: 1995 ford 7.3 litre diesel glow plugs
the best way i have found to test glow plugs is to disconnect the wire to the plug and get you 12volt test light and put your negitive lead of the test light on the positive battery cable so when you touch the test light to any ground the light will light. so now go check your glow plugs and if you have one that doesnt light the light its burned out.
good luck
SOURCE: 1995 mitsubishi pajero glow plugs
When you turn on the key, a relay engages for a few seconds and heats up the glow plugs. It sounds like the relay is not passing current, which could indicate either corroded contacts, or a bad relay all together. I would guess the former since your panel light indicates the relay is functioning correctly. I would suggest replacing the relay, or possibly if you feel comfortable with it, disassemble the relay and clean the contacts.
SOURCE: No glow plug light, car turns over but won't start, no CEL or codes
I don't have the solution but a possible help in diagnosing. If you remove the water temperature sensor connector from the sensor, the glow plug light should stay on when you go to start the car. Try leaving it on for 15 seconds and then start the car. If it starts right away, it is your sensor. If it doesn't, the good luck.
The sensor is located on the right side of the engine near the top, at the back. It is in the coolant fitting directly behind the hose from the rad, just left of the thermostat. Be careful to disconnect the wires, and not remove the sensor, or you will loose a lot of coolant. The sensor is held in by a separate plastic clip, and the harness just has a little built in clip on the side. Hope you have small hands...
SOURCE: Problem with cold starting Ford 7.3L Diesel at > freezing temps
most likely the relay. its located to the left of the fuel filter( looking at the motor from the front). my experience is that they only last about 50,000 miles. the part costs about $20 at an navistar dealer. remove the cowl over the filter, disconnect the batteries(so you don't short the new relay out if you cross the polarity with a wrench) ,remove the four wires from the ceramic relay, un-fasten the relay from the base. reverse the process with the new relay. CAUTION; do not over-tighten the nuts on the wire studs, you could crack the ceramic relay.(iv'e done it) . hope this helps
SOURCE: how do i test the glow plug relay on 2002 ford
test by puting a volt meter to the glow plug top and earh and check for voltage
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