Glow Plugs Not Warming??

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Joined
Jul 15, 2008
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29
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Location
Salmo, British Columbia, Canada
Hello all,

After searching this forum and trying a couple of things on my own, to only meet failure has prompted me to put this problem out for troubleshooting.

My rig is a 1983 BJ60

Problem: While starting the truck, turning the key half way to activate the glow plugs, results in the glow light flickering on for only a brief second then turning off. Turning the key to the full start position after leaving the key at the halfway position for a period normally required to warm the plug, results in the engine not turning over unless i repeat the process repeatedly (basically I'm forcing the engine to start which cant be good)

My voltage gauge read less than 12 V whearas it used to read about 14 (2/3rds the way up the indicator) when the truck was starting normally.

The voltage drains from less than 12 after a start but recovers to just less than 12 suggesting the alternator seems to b working.

Checked battery terminal connections, cleaned them off and reconnected with dielectric grease. Still no change.

Replaced both batteries with new ones, now it reads only about 13 and still there is no sustained glow light, and a laboured start.

Possible culprits??

a) one positive battery terminal cannot be tightened since the nut is sunken too far into the terminal clamp. The connection is not snug but there seems to be sufficient contact. Should I replace the connection?

b) I hooked up PIAA aux headlights a while back about 1 month prior to this. I spliced them into the power to the headlights. The led on the PIAA light switch is always on when PIAA headlights are not activated.. would this cause a drain when the truck is parked?

c)Recently I replaced the existing 4 way connector that had been originally spliced into the rear light wiring loom, intended for a trailer hook up. I did not change the existing splicing orientation (which was present long prior to the glow light problem) but just replaced the connector.

I appreciate any help you guys can offer:cheers:

( I gotta keep this truck running as my dd)

Lee
 
More info in the Diesel section... but since you are here...

Don't trust the glow plug light - mine only comes on long enough to go out - but the plugs are on. When glowing, my volt meter reads about 8V and depending on temperature, can take up to a minute for the plugs to cycle to low. Listen for the glow plug relay under the hood to go "clunk" and you volt meter will rise.

However, the voltage issue you describe while driving sounds like some of the diodes in your alternator are buggered. Do youself a favor, and have them ALL replaced at the same time... Don't ask me why I know...
 
I am experiencing a similar problem with my 1984 BJ42. The glow plug light just flickers on for a millisecond and goes out. I don't believe the glow plugs stay on because it has to crank over a lot longer before it starts - and only if the engine isn't too cold. Where is the timer relay and what does it look like. I have searched under the hood and have only found the glow plug relay and another similar relay beside it. The second one does not seem to be working properly as it does not activate the silinoid switch. This power supply seems to lead to some sort of intake manifold sensor which has two large wires. The top one gets power but the one underneath does not. Could this be the real problem?
 
Check the glow plugs to make sure they are all working. There may be instructions in the diesel section or you can buy a manual like Haynes.

You mention 13v and one positive terminal and replacing both batteries. Most diesels in Canada and the US are 24V systems with 2 batteries. My gauge reads more like 28v when running. Do you have a 12v or 24v diesel?

Is it possible that the batteries are connected incorrectly, if it is a 24 v system?

Assuming you have a 24 v diesel, adding 12 V accessories can drain one battery, if they are connected to only one battery. This will result in killing both batteries eventually, by undercharging one and over charging the other.

The headlights are an exception as they are connected to each battery separately to run 12v headlight.
 

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