Glow plug light won't come on

Maybe you got a bad glow plug controller ! Did you use a aftermarket part or OEM replacement ?

81418784532&item=281418784532">G1900 Kubota, the glow plugs are energized when the keyswitch is moved halfway to the start position. Also the glow plug indicator light is illuminated when in this position. I hold the key in that position until the glow plug light goes out, and then crank the engine. On really cold days I repeat the glow plug cycle several times before cranking.

check that the relay is working as the plug indicator gets the power after the relay . It may be a fuse . If the relay is ok then pull the Glo-plugs and have them check

Its not uncommon for the crankshaft postion sensor to play up on these. What engine is in the vehicle.

When light goes out glow plugs still heating so count 15 seconds after ligh goes out the crank on key

need to check the glow plugs.Simple.
Take a test light ,hook the clip to the POSITIVE post of the battery.
Unplug the feed wire from all the glow plugs ,
The light should light on all 8 when touched to the top post.
If you have 1 or 2 that don't work it might start ,any more and it won't.

No power to the glow plugs means no power to the light also. You have a bad fuse or connection to the glow plug relay. Fix that and your good to go. Has nothing to do with your indicator lights on either side of dash. Glow Plug power indicator is labeled THAT and only that.

The first thing to do is locate the owner manual.

Look for the glow plug relay MAIN FUSE location.

The glow plug portion of your van is not working.

This difficulty scale from 1 to 10 is a 9.

You will need a DVM and tool undo the cables to each glow plugs.

It's a 1 to 2 hours troubleshooting job.

I'm going to fire off a quick list

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Check / replace blown glow plug relay main fuse
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Disconnect each center nut of the glow plug wire. PLEASE CHECK ONE AT A TIME.

Read the resistance between the center of the glow plug and the metal base of the plug.

Please take good note on each glow plug resistance reading.

MAKE SURE all cables are put back and tighten properly.

Compare the resistance on all cylinders.

OPEN/high resistance is bad glow plug.

In general 3 ohm or less is OK.

You should buy one and use its value as baseline.

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Glow plug relay can be bad.

You will need the VOM and a friend to turn the key.

Check the voltage to each glow plugs. It should be 12.6-13.6 volt.

Be careful,the plugs will get HOT.

Compare the voltage on each cylinders.

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So the problem can be combination of

glow plug relay

glow plug relay main fuse

glow plugs

ignition switch is unlikely but I'm going to list it anyway.

Once again,this is a difficult and time consuming job. I will ask a friend to help out,

Good luck.

I'm going to assume you has the diesel version of the Sprinter.


Diesel is just like a good old COX airplane engine.


The engine need to heat up by glow plugs.

You need to turn the key to on position and let the glow plug relay to energize the glow plugs for 5-X numbers of seconds first.......it all depend on the temperature.

The temp. sensor on the engine block will take all the guess work out for you.

When the dash indicator goes out then your are ready to start.

This is the correct procedure to start an diesel engine.

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Please disregard this post if you has a gasoline version of the Spiniter.

glow plug relay is going out