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I am not sure how to test if i have power going to my glow plugs i tested the plugs for continuity ad they appeared finr but i am not sure if i am getting power to the plugs any help would be appreciated

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  • Cars & Trucks Master
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Disconnect the lead to the glo-plugs and install a multi meter on the end of the wire .red lead to the wire and black lead to earth . set meter to read volts DC and turn on the ignition to start position . If there is power in the wire the meter will read 12 volts. If nothing then check the realay and fuses.

Posted on Jan 03, 2014

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Posted on Jan 02, 2017

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fastboyz
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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

Posted on Oct 27, 2008

  • 1 Answer

SOURCE: Nissan vanette not starting from cold

My vanette had exactly the same problem yesterday. The glow plugs have a timer and a relay. I think that if the light on the dash goes on and off as normal then its probably the relay not the timer. So I have replaced the relay (£50 nissan dealer only) which is located in the center console below the radio/heater controls. Until its really cold again tomorrow I wont know if its really cured it but I'm fairly certain that will be it.

Posted on Nov 01, 2008

  • 832 Answers

SOURCE: 1997 VW JETTA DIESEL GLOW PLUGS

You have to replace the defective glow plug. You can test the glow plug without the test light. Just put a wire on the bolted end of the glow plug and connect this to the battery (+) terminal. Then, put a wire around the body of the glow plug and connect this to the battery (-) negative terminal. Hold at this position for a minute or less. Good glow plug will heat up.

As far as the wiring schematics, I will just describe
it. Your ignition switch is connected to the positive
terminal of the battery by way of the fuse in the fuse
box. From the switch it goes to a timing relay before
going to the glow plug terminals. The glow plug body
is screw mounted to the engine block which serves
as the negative terminal. So, as you switch your
ignition, it heats up the glow plug enough to give a
combustion of the atomized fuel in the cylinder piston
of your car causing it to run.

Posted on Nov 21, 2009

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A commonrail diesel ford ranger won't start,but it crank


You would need to check the glow plug timer circuit and the fuel supply. Diesel glow plugs can wear out. Make sure the "Ready light" is working and that you hear the timer cycling. Usually the lights will dim as the power goes to the glow plugs.

The glow plug wire can be checked with a Voltmeter inserted on a wire from the Relay timer. The glow plugs are tested when they are removed from the engine. If you get this far, you can use battery cables to test them. They can melt. Ask for more details about proper procedure.

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Having cold start problems 2006 h.d. f350 ,truck is parked in heated garage all night,starts normal in the a.m.,sits outside all day at work,soon as temp falls below 30 F it starts then stalls immediately...


glow pug indicator and glow plug themself are 2 seperate system
test for power at the glow plug harness conector 1 each side over valve cover
test light clamp on batery neg test each wire going to relay for power on both side
then quick check on glow plug end test light clamp on positive test all wires
going to glow pug on each side f this does ligtht up the test light system should be o.k.
for the FICM i have used a hair blower on hi to warm the surface of if to start up a few of
these motors to get them back to the yard for replacment afterward
run a ffeet of these from 250 to 550 lots of problem and work 26 units
good luck

Feb 25, 2011 | 2006 Ford F 350 Super Duty

1 Answer

7.3 Liter Diesel starts hard in morning, ok if not left more than 8 hours. How to check the Glow Plugs?


Your glow plug relay is located on the top of the engine on the right side toward the front. Some models there are 2 solenoids. A large one toward the front and a smaller one right behind it. The glow plug relay is the smaller one toward the rear. The larger front one is the intkae heater relay. To test the glow plug relay turn engine to on. dont start it. both of the large terminals should have power with key on. then turn engine off. only one large terminal should have power. If when you turn engine to on you only have power on one side then go to this test. Turn engine on and test smaller wire. it should have power. If it does replace the relay. If the smaller wire does not have power you have an ignition problem or power (wiring) problem to the relay. Also note the engine needs to be cold. If temp of engine is over 130 the computer will not turn the glow plug circut on! Most of th time this is what fails and not your glow plugs.

Oct 27, 2010 | 1996 Ford F350 Crew Cab

1 Answer

Tried to start 2004 f250 with out glowplugs now it wont start. checked fuse still wont start


glow plug light and glow plug are not on same system
check at gow plug conection (top of valve cover both side
follow from relay front valve vover right side silver box)
power 12 volts on all 4 wires in both conector left and right
if not replace relay if 12 volts relay ok (test light clip on ground)
then check glow plug (test light clip on positive ) touch wires going
to glow plug should light up if ok (quick test ) if any fail replaced
if all seems ok look at the oil injection system most common
problem with these motors I have yet to replaced a glow plug or relay

Sep 30, 2010 | 2004 Ford F350

1 Answer

After cool down motor only engages after prolonged starting;proceeds with rough ilde eventually runs normal 2005 f 350 deseil


test glow plugs if 6 liter on the side of the head test for electricity geting to them during glow plug cycle then test each one for continuity carfull study the plugs they are a little ****

Jul 12, 2010 | 2005 Ford F 350 Super Duty

1 Answer

1992 F250 7.3 idi diesel glow plug relay has power to two large posts and one small post and the second small post pulses when activated. I checked ground to engine and seems to be gounded fine. Any ideas...


Have you checked the glow-plugs? On that system if one glow-plug is burnt up than it will not let the main relay in the controller to kick in.
Check all the glow-plugs make sure they are working.
The easiest way to check them is with a regular 12v test light.
Hook up the negitive end (aligator clip end ) to the battery + terminal and than with the other end of the test light ( pointed end ) touch each glow- plug connector tip ( with the glow-plugs harness connector removed ) and see if the test light lights up.
If the test light up--- glow-plug is good. If not than the glow-plug is bad--burnt out .

Feb 13, 2010 | 1992 Ford F250

1 Answer

Glow plugs flashing when engine is running


HI. This is an indication of a failing glow plug. It will be necessary to test each plug to isolate the issue, or run a diagnostic scan on the CPU. During the scan, you should be issued a code that will isolate the actual glow plug that is malfunctioning. If you insist on testing each plug, use my procedure below to assist. You can find the resistance specs in your operators manual.


A test light can be used to determine if the glow plugs are working.


1. With the test-light grounded, insert the test light probe into a glow-plug wire to check for continuity.

2. If the light comes on, check the other cylinders in the same manner. If the test light failed to light, check for continuity at the glow-plug relay.

3. If no power is present, check the control circuit of the glow plug relay.

4. If the control circuit is working, the relay may be defective (FYI, manufacturers may have the system fused and fusible links may be located throughout the system).

5. If the glow-plug circuit is working, the glow plugs themselves may be defective.

Checking glow-plug resistance:(Remove the plug for this test)

1. With an ohmmeter, connect one lead to the terminal and the other lead to the body.

2. Read the resistance and compare to specifications.

3. A visual inspection may also be necessary to check for excessive carbon buildup and physical damage to the tip.

4. A glow plug that has excessive carbon deposits on its tip can give the correct ohmmeter reading but still not work. Clean the tip with carbon cleaner.(DO NOT USE A BRUSH TIP CLEANER)

Jan 06, 2010 | Ford Focus Cars & Trucks

1 Answer

1800 fiesta diesel wont start just stoped cam belt fine and some fuel getting to injectors


Has glow plugs --check them. you can use a 12v test light or an volt/ohm meter to test each plug. Disconnect the connector on the glow-plug ,then and touch with a 12v test light --one lead to a12v supply.If the test light lights up that plug is good. or with a volt/ohm meter ,one lead to ground and the other touching the tip of a glow-plug--that's on the ohm's scale --if it reads --showing continuity,then that plug is good.
If all check good you may have a bad glow-plug controller.

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2 Answers

Engine turns will not fire up glow plug sign flashing


HI. Usually, when this light illuminates, it will signal that one, or more of the glow plugs are malfunctioning. I recommend to test all glow plugs, so that you may isolate the defective plug.

A test light can be used to determine if the glow plugs are working.


1. With the test-light grounded, insert the test light probe into a glow-plug wire to check for continuity.

2. If the light comes on, check the other cylinders in the same manner. If the test light failed to light, check for continuity at the glow-plug relay.

3. If no power is present, check the control circuit of the glow plug relay.

4. If the control circuit is working, the relay may be defective (FYI, manufacturers may have the system fused and fusible links may be located throughout the system).

5. If the glow-plug circuit is working, the glow plugs themselves may be defective.

Checking glow-plug resistance:(Remove the plug for this test)

1. With an ohmmeter, connect one lead to the terminal and the other lead to the body.

2. Read the resistance and compare to specifications.

3. A visual inspection may also be necessary to check for excessive carbon buildup and physical damage to the tip.

4. A glow plug that has excessive carbon deposits on its tip can give the correct ohmmeter reading but still not work. Clean the tip with carbon cleaner.(DO NOT USE A BRUSH TIP CLEANER)

Oct 22, 2009 | 2003 Jaguar X-Type

1 Answer

2000 tdi wont start!!!


glow plug relay is marked #180 on the housing.
in 0 to 11 degrees they have a starting prob were the glow plugs go on and off very quickly.need VAG.com to exstend glow plug timing.
to test glow plugs disconeect ect turn key on plugs should draw 15 amps each 60 amps all together.if you dont have amp meter use test light.

Nov 24, 2008 | 2000 Volkswagen Jetta TDI

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