Glow plugs staying on (1 Viewer)

Joined
Dec 18, 2017
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84
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Medicine Hat Alberta
hi, sorry to bother you all. I have a 1978 BJ43 that I just purchased recently from France.
Today I went for a drive and the glow plugs are staying energized and will not go off. Whether ignition is on or off, the coil on the dash is glowing. Usually I have to turn my key backwards and hold in order to energize the glow plugs. Now they are on while driving and even when I shut the key off.
Does this sound like welded shut relay contacts to you? Also is this located passenger side inside firewall?
Thank you and sorry to bug you.
Can I fix this by adding in a switch some where?
 
Joined
Jul 22, 2003
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18,311
Location
Perth Western Australia
I think the problem might be just the light staying on rather than the glow plugs. They would burn out after a few minutes I think. Glow timing is a delicate balance of providing enough heat to get the engine running smooth and longevity of the plugs?
Have you attached a test lamp to the bus bar to see if they really are energised?
 
Joined
Dec 18, 2017
Messages
84
Location
Medicine Hat Alberta
The issue turned out to be that the contacts inside of the relay were fusing together. I could see that there were small pieces of what looked to be welding slag in between the contacts. I took them apart by removing the spring and then filed them smooth with a fine file. I then used a small knife sharpening stone to get a nice polish back on the surface. Once back together all was fine.
 
Joined
Dec 18, 2017
Messages
84
Location
Medicine Hat Alberta
I am not sure. I need to look at the wiring diagram however I think that the glow plugs we probably on as well. When the contacts close in the relay there is more draw going through than just the coil on the dash I am sure. After I fixed the relay, the Cruiser fired right up though.
 

PAToyota

Keystone Cruisers
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Joined
Oct 4, 2009
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2,275
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South Central Pennsylvania
The relay would be controlling the glow plugs - no need for it to just control the light.

I'd check the glow plugs at this point. Most times they don't appreciate being on for more than a few moments at a time.
 

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