What's your problem?the orange light that shows glow plug is warmimg up stays on for bout 4 seconds. i have to repeat this process bout 4 times. the motor cranks but only after struggling a little

Sounds like a faulty glow-plug controller.
I have wired the glow plugs directly, and it worked fine until my brother held the button too long and burned them out.

sounds as though the cylinder,s etc are a bit clogged up, try some diesel fuel addative,as with all diesel engines if they do not get long and regular journeys the glow plugs,injectors etc get clogged ,as the engine does not get hot enough to burn these deposits off on short stop start types of journey's . you are possibly looking at replacing the glow plugs but give the addative a try and if possible take for a long drive 2-3 hours at steady highish speed , ok to repeat the addative and long drive once more ,if no improvement will need to go into the repair shop to have the glow plugs seen to at the very least , good luck

to test a glow plug you connect a jumper lead to the positive terminal and put the body on the negative terminal of the battery
If they are good the element will glow red to white is seconds
Brand is immaterial-- no glow = no good

What you need to do is make sure the key is off, remove glow plugs, hook a set of jumper leads to your battry, put the negative lead around the threaded part of the plug, hold the + jumper lead to the top of the plug where the power rail bolts on. DO NOT TOUCH glow plugs as they will heat up hot & fast. If the light comes on 6 - 8 sec thats how long you need to hold the power on. The tip of the plug should be nice & red hot in this time. Repeat for all plugs & see the diffrence If more than 2 are dead (no red heat) or noticably slower than the others It will be very difficult to start & the plugs should be replaced. AGAIN carefull not to get burned.

Your diesel vehicle is equipped with glow plugs, and also with a Glow Plug Light that will either come on and stay on, or flash or blink when a fault is detected by the ECU (engine management unit). When the Glow Plug Light comes on, the ECU stores information about the condition that has caused it to come on.4 Jan 2016

Is It Safe to Drive With the Glow Plug Light On? ' YourMechanic Advice

https://www.yourmechanic.com/article/is-it-safe-to-drive-with-the-glow-plug-light-on Glow plug light wont go out Google Search

The glow plugs work in direct relation to the engine block temp. The relay for the glow plugs is obviously reading the wrong temp, that's why they turn back off. It's most likely that the temp sensor is bad, but trace the wires back and make sure there are no breaks in the insulation and they are well connected at the plug-ins. I have seen a lot of wires at the connector look good but fall off as soon as you touch them.

If the temp sensor is the same on for your your dash, then borrow a heat sensing gun and double check it against the guage. I have seen them read wrong by as much as up to 20 degrees. If the sensor reads rught and feeds both the guage and the glow plugs, then the problem would be either the wire harness or the glow plug relay. Hope this helps.

No the glow plugs circuit is separate. They actually are on a timed delay shut off. Check the glow plug relay module behind the driver side headlamp assembly. If the light on the cluster is staying on all the time it's simply letting you know there is a fault in the glow plug circuit. Doesn't actually mean that the glow plugs are staying on all the time. You might just have a bad glow plug which is breaking the circuit therefor the glow plug light stays on. To check this use a test light and have someone turn on and off the ignition to see which plug doesn't light up.

YOU CAN HOOK A 12 VOLT TEST LIGHT BETWEEN THE POWER RELAY OUTPUT TO GLOW PLUGS AND GROUND.WITH ENGINE COLD IGNITION SWITCH ON ENGINE NOT STARTED.THE TEST LAMP WILL LIGHT WHEN IGNITION IS TURNED ON.LAMP WILL BE LIT FOR FOUR TO TEN SECONDS DEPENDING UPON ENGINE COOLANT TEMPERATURE.TEST LAMP WILL THEN REPEAT ON OFF CYCLE.AFTER ENGINE IS STARTED.THE TEST LAMP CONTINUES TO REPEAT ON OFF CYCLE FOR 20 TO 90 SECONDS.LAMP WILL CYCLE FOR A MAXIMUM OF 90 SECONDS AFTER ENGINE IS STARTED.ENGINE STOPPED THEN RESTARTED.TEST LAMP WILL LIGHT IF COOLANT TEMPERATURE AT THE ENGINE TEMPERATURE SWITCH HAS FALLEN BELOW 165 DEGREE.BETWEEN STARTS THE SYSTEM WILL OPERATE FOR A SHORTER PERIOD OF TIME THAN WITH A COMPLETELY COLD ENGINE.TEST LAMP WILL REMAIN OFF. IF COOLANT AT THE CONTROL SWITCH PROBE IS AT 165 DEGREE OR HIGHER.

You have to check if you really glows comes to power that can show you the light on the dash that are working and maybe the relay of the glows does not work and you will pass voltage. Try a thick cable you put something in the battery positive and the other end touch the tip of the glow should produce a spark pquena holds about 20 or 25 seconds and give him star should work well. Thanks

the glow plugs probably need replacing, it seems they are not heating up the gas enough.