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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.
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Connect a volt meter to earth and glow plug supply wire, turn ignition on, should get a battery voltage reading for about 10 seconds, if not the timer relay is not supplying power. If you get voltage, remove the glow plugs and test with an ohm meter for resistance, (no reading? open circuit, not working). Heater relay is a heavy duty relay with a 60amp battery supply, generally in the bulk head area. (DON'T DIRECT FEED THE GLOW PLUG! could burn them out)
Hi
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Get a test light and put it onto the tip of the glowplug then get someone to turn ignition on. See if test light turns on.
This needs to be done when cold or it wont work.
The coolant temp sensor switches the glowplug relay via the ecu, so when hot, it wont switch.
A computer diagnostic test would be the best bet to clearly verify a relay failure.
Your problem is likely bad glow plugs or a bad glow plug relay. Glow plugs can be checked, basically, with a continuity test or the relay by finding another one to exchange yours with.
Warning: be extremely careful with the removal of plugs. If you snap one off it will likely cost a fortune to repair. If you use a mechanic make sure they are fully aware of the problem.
If you wish, reach me thru www. StormwindAlpacas.com
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.
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 engione 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.
My glow rail would come on for a very short time, then turn off (less than 1 second). Replaced the control wire for the glow relay, with a test lead from battery to relay control terminal - relay was working fine (relay is between batteries).
Checked the engine temperature sensor (located on top of the housing where the top radiator hose attaches to the engine). Take out and test in a pot of water (need a 19mm deep socket to remove). At 0 deg C should be 8.6K ohms At 20 deg C should be 3.25K ohms At 40 deg C should be 1.5 K ohms At 80 deg C should be 300 ohms I replaced the temperature sensor with a 8.2K ohm resistor (engine cold). Then tried with a 1.2K ohm resistor (engine hot). Each time I tested the glow rail at the relay (with a multimeter) it would turn off after about 12-14 seconds, which is normal, to protect the glow plugs and battery drain (they come on again when engine is starting).
When I put the temperature sensor back in, the glow rail was working fine again - only thing I can think of is that the contact between the sensor and the plug, may have had a oxide formed and caused a high resistance or open circuit, indicating to the glow controller that the engine was hot and did not need glow activation. So try taking the plug off the temperature sensor, and reattaching it again it might be all it needs, to clean its contacts.
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)
Golfs have a 'Heater' fuse which is a metal strip labeled 55 or 80 amps located under a clear plastic cover. There is also a glow plug relay in the fuse block but that would not turn on the glow indicator if it died.
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)
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