Glow plug light dose nt cycle like it should.

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.

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

The code P0674 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #4 to fail to heat up. The entire circuit must be checked to locate the fault.

Symptoms With just one glow plug failure other than the check engine light coming on, the symptoms will be minimal since the engine will normally start with one bad plug, under freezing conditions you would be more likely to experience hard starting.

Potential Causes The causes for this DTC may include: Faulty cylinder #4 glow plug Open or shorted glow plug circuit Damaged wiring connector Faulty glow plug control module Diagnostic Steps & Possible Solutions You will need a digital volt ohm meter (DVOM) for the complete test.
Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code. Check the cylinder #4 glow plug by disconnecting the wire connector on the plug. Place the DVOM on ohms and place the red lead on the glow plug terminal and the black lead on a good ground. The range is .5 to 2.0 ohms, if it is out of range replace the glow plug.

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 .

i condem all the sensor and circuit of the module of the glow plug as well as rha relay

check the fuse for the relay for the glow plugs
check replace the relay

i have a nissan terrano 2.7 dti heater light not coming on some times dose and some times does'nt and it wont start

IF HE GLOW PLUG LIGHT IS FLASHING THEN U HAVE BURNT OUT GLOW PLUGS.

glow plug relay in the engine bay fuse box, check this they wear out over time.

Most likely ignition switch has gone bad.  Don't need to worry about oil pressure light IF the motor is not running, but IF it IS running, shut down motor immediately until oil pressure can be verified with an external gauge.
good luck

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