Super glow circuit problem.....

[surfer_21]

Ive got a 1985 HJ60 diesel landcruiser.
Im trying to trace a problem in my glow plug timing circuit.
In the workshop manual it refers to glow plug relay 1 and 2.
Glow plug relay 1 is next to the starting relay on the fender apron by the air filter.
Where in hell is the relay 2???? Its says its on the fender apron too
Please desribe where it is if you know the whereabouts of this lost relay.
Basically the first start of the day takes about 30 sec at around 20 degree celcius. According to the manual as soon as light goes out it should start.
My light goes out after approx 2 sec which is about right according to specs.
thanks

 

[fe sus]

Do a search for "wilson switch." This is a common mod that many of us have done that solves many super-glow system issues.

 

[fe sus]

Oh...

And welcome to 'mud.

 

[Scoot Jockey]

I don't have a 60, but on my 47 both relays are up front, on the right of the radiator. One is cylindrical, and the other is sort of cube shaped. Do your glow plugs test out okay? You do need to remove the buss bar to test them all individually. It sounds like your thermo sensor is working properly, but you should also check the resistance on it. My bet is that your glow plugs are shot.

The Wilson switch is used successfully by many here on mud, but I am still happy with the stock setup, for now...

 

[phatwheels]

2nd the Wilson Switch

Having just done the Wilson Switch I would recommend doing it as well if you are having any problems. Takes 30 min if you know what your doing. The relay you want to turn on is the round one with the two posts on it. The cube on that looks like the starter relay is the 2nd one.

I found when doing the Wilson switch the fatter (of two) black/red stripe wire was the one going to the main glow plug relay. Also a black and yellow wire that went to the original glow plug timer is sending power with the key on rather than taking the power from under the dash, just allowed cleaner wiring. Also the wires to the glow plug light can be removed from the plug in the dash so you don't have to deadhead any wires. But no matter how you do it its really easy and effective.

 

[cruiser_guy]

Take the connector bar off that ties all glow plugs together and check resistance of each plug. If the connector is left on one good plug can make it appear that all are good! Chances are one or more are dead. The ohm meter should show continuity if the plug is good. Measure between the tip of the plug and the head of the engine.
I also find that starting is easier if you let it glow longer. I let mine glow until I see the voltmeter jump up AFTER the glow light goes out. If it's really cold, glow it twice.