M1009 How Many Volts To Glow Plugs

[bgfd2216]

My 1984 M1009 is at my local repair shop which my friend is the owner. I have put two sets of glow plugs and a new controller and the plugs keep burning up. He told me that all of the glow plugs are showing 24 volts is this correct? What could be the problem.

 

[Warthog]

We have discussed this multiple times.

In a stock system, GM designed the system to feed 24v to the resistor pack and then to the plugs.

When the system is functioning properly, the resistance of the the resistor pack and ALL of the glowplugs drops the voltage to 12v

The plugs are 12v versions.

If one plug burns out, then the the total resistance drops and the voltage increases to the rest of the plugs. This causes more to burn out and the voltage to continue to increase until the last "good" plug is receiving the full 24v and has a very painfully death.

This is why some of us recommend removing and bypassing the resistor pack and residing the GP system for 12v

 

[bgfd2216]

Is there some literature that I can find and give to him to be able to do this? Sorry I dont know much about the electric system

 

[chevyCUCV]

 

[Warthog]

Do an advanced search for "resistor bypass" posted by Doghead.

There has never been a "official" write up for This change.

All it takes is about five minutes. Some electrical tape. And a ring terminal and crimp tool.

 

[DriverSideImpact1008]

^^Ditto. What Warthog said. Doing the resistor bypass is super easy! There was a post last week talking about the resistor bypass, and it had several links to other threads talking about it, and some pictures.

 

[IdahoPlowboy]

I really need to do this mod.

 

[that1028guy]

Ditto, My resistor pack is working for right now, But I dont want to find out the hard way it decides to shoot crap.

 

[tbearatkin]

Is there some literature that I can find and give to him to be able to do this? Sorry I dont know much about the electric system

Here is one method some say overkill or not the simplest but it was pretty simple for me.

http://www.steelsoldiers.com/cucv/56682-what-why-did-smoke.html