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No power to the glow plugs. what i can do to sort this out


Check all fuses for the glowplugs then check glowplug relays/modules are working.most relays/modules run up to 15seconds

May 02, 2017 | Cars & Trucks

1 Answer

1996 ford 250 glow plug fuse keeps blowing


There are not many parts in this system. You have Glowplugs, a timer, and a power relay.

Check the glowplugs. To check you take battery cables and place the fixed connection on the case of the glowplug, avoiding the threads. Then touch the top of the glowplug with the other cable. You can MELT them if you hold the top cable too long.

If you take at least 1 bank of glowplugs out at a time, you can compare them. They should glow equally bright. A dull glowplug is bad. If you do it one cylinder at a time, you will not be able to compare them.

If all check out okay, then it only leaves the timer or the power relay. The timer is a good candidate because it controls how long the pulse will be and that can be what is shorting out the system.

Oct 27, 2013 | 1999 Ford F250 Regular Cab

1 Answer

MY 93 FORD 350 7.3 I PUT SWITCH ON AND START CLICKING RIGHT AWAY BEFORE WILL TAKE FEW MINUTES SEEMS LIKE T GLOW PLUG IS NOT WORKING RIGHT IF I PLUG THE ENGINE WILL START WITH NO PROBLEM ,SOME PEOPLE


This is not to hard to solve. The outside airtemp determines how long the Glowplug timer works for absolute cold starts. Starting a warm engine is affected by underhood temps.

The Timer Relay will pulse power to the glowplugs. If the glowplugs are good, it is enough to preheat the cylinder for firing.

To tell if a glowplug is good is a matter of comparision between a new glowplug and a worn glowplug. YOU CAN MELT A GLOWPLUG WITH THIS TEST, but you remove the glowplugs, get a set of battery jumper cables and place one jumper to the base of the glowplug USING CARE not to ruin the threads on the glowplug.

You do not want to arc the spark on the glowplug threads. You want your fixed jumper connector locked on the base of the glowplug. The other battery cable jumper is touched to the top of the glowplug where the arcing occurs. This will not hurt the contact point if done properly.

You compare the "glow" of the old glowplug to the "glow" of the new glowplug. Bad glowplugs stay dark or operate at a darker color.

The Timer Relay gives you pulses and that is all the glowplugs get to heat up. This is what you simulate in your test. If a glowplug operates in a dull or dark condition, it is bad and throw it away. You want all glowplugs to readily light up when power is applied.

The other 2 parts to the system are the Timer Relay and the Power Relay. The timer gets its power from the Power Relay and the Power Relay is like a starter solenoid. The Power relay gets a tickler charge when the keyswitch is held to Start.

There are sometimes extreme cold Timers that hold the power longer tothe glowplugs. I do not have the Specs to tell you if your Timer is kicking out to soon.

I hope my solution helps. I have told you how to test your glowplugs. The timers are affected by air temperature and that makes it difficult to say if it is working long enough. If you know the glowplugs are good, and the timer shuts off before the glowplugs heat up, then you need a new or different type of timer.

Sep 26, 2012 | Cars & Trucks

1 Answer

HARD STARTING IN THE MORNING [DIESEL ENGINE]


Hello, The diesel engine relies on Glowplugs for the first start in the Morning or a cold start at anytime.

The Glowplugs themselves can be bad, but there is a Timer which determines how long the Glowplugs will stay on. Before the Timer is a Glowplug Relay which gives the Timer its power to operate. The Ignition switch provides power to the Glowplug Relay.

You disconnect a Glowplug wire, put on a test instrument (either a testlight or Voltmeter) and look to see what happens when you initiate a start. If the testlight lights and cycles a few times like a pulse, then the power supply is good. If not inspect the Timer and Glowplug Relay for continuity

If all the pulses seem to reach the Glowplugs, then most likely the Glowplugs are worn out. Test by removing then and connecting battery jumpers. Briefly touch the top terminal of the Glowplug with the Hot cable after grounding the negative cable on the base of the Glowplug, avoiding the threads.

You can melt a Glowplug. But if you find the Glowplug staying dark, then it is bad. Do this for all the Glowplugs and replace the bad ones. Remember the Glowplug only has the amount of time the Timer gives it to work. So if a few pulses do not make it Glow, then replace it. This should fix you up.

Aug 24, 2011 | 2005 Ford Expedition

1 Answer

Change out glow plugs


Hello, Its just like changing sparkplugs. First, you should check the timer for proper operation before blaming the glowplugs. The timer is the part where the wires on the glowplugs come from. Its' the Timers job to heat up the glowplugs and there is a Relay which activates the timer.

Once the Timer gets power from the Relay, it sends spark to the glowplugs and measures the amount of juice flowing through the glowplugs. When a predetermined limit is achieved, the Timer shuts down and sets a light on the dashboard that you can start the engine.

If you have a bad glowplug, that cylinder will not fire cold and the engine will miss, run rough , and spew black smoke out the tailpipe. A complete changeout of the glowplugs will solve the problem, but individual glowplugs can be tested and changed independently at a lower cost.

To test a glowplug, you can use jumper cables and apply voltage to the glowplug in limited amounts or you will melt the glowplug. Best to place the negative on the base and avoid the threads. Then touch the top of the glowplug and watch to see how quick it turns bright. Its a matter of comparison, and the darker the glowplug stays, the worse it is.

There is no adjustment on the glowplug, just swap them out and you will be fine. I hope my solution is very helpful to you. You can check the Timer with a voltmeter by removing a glowplug wire and hooking the hot lead from your meter and grounding the other wire on your engine. When you turn the key to the warmup position, the meter should briefly show power.

May 02, 2011 | 1984 Ford F 250

1 Answer

Hi there, i have a 1991 Izuzu mu, 2.8 turbo. Everytime i turn the key on the glowlight or glowplug fuse keeps blowing. Its on the inside of the car not the bigger one under the bonnet?


There will be a relay that switches the power to the glowplugs on and off, probably mounted in the fuse/relay box near the big fuse under the bonnet. Check this relay and associated wiring for a short circuit to ground

Feb 28, 2011 | Isuzu MU-7 Cars & Trucks

1 Answer

Fuze for glowplug keeps popping


Remove the glow plug and connect it to a battery through an ampmeter, read what the current draw is. If it is far in excess of the required fuse rating there is a problem with the glow plug, renew it. If the current draw is acceptable there must be something else on that fuse that is drawing excessive current. Check if anything else is inoperative if the glowplug fuse is out of circuit.

Jan 16, 2011 | Ford Ranger Cars & Trucks

1 Answer

2000 jetta tdi , went to start it glow plugs wouldnt come on , after awile it started, automatic tranny wouldnt shift . stuck in high gear , hat to manually shift it


Hi is this a jetta 4 or 5
If jetta 4 you have to look at the glowplugs itself
If ok check fuses
If ok replace Glowplug relay 103

Dec 08, 2010 | Volkswagen Jetta Cars & Trucks

1 Answer

How.to.replace.glowplugs.in.a.isuzu.troper.3.1.year.00


Take off the intercooler and you will see them by the injectors .

You need a good quality deep single hex socket ,say 3/8 drive to suit them (12mm ). and a bar for that socket to turn the old ones out and the new ones in .

Check your 40 amp glowplug fuse as well .

Jan 01, 2010 | 1999 Isuzu Trooper

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