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And with a search for the NSN and a look at parttarget, it shows 3 manufacturers for the filter. It's a special filter that is not made by other normal filter makers. http://www.parttarget.com/2940-00-974-9669_2940009749669_7737491.html

They are not all 12 volts. Mine simply uses a thermocouple and milivolts(self created). So, it take no power!

From your description, I will guess you have a frozen PPV(search that). Clear descriptions and proper terminology will help with a speedy and accurate repair. M939 is a series of trucks, what model number is your truck? 931, 923, 925? Also, you do not have air actuated differential locks, so...

12 or 24 volt?

Someone tried to take a picture of me, but their camera broke.

How did you supply the light? If you wired them to 24 volts, you most likely blew them the moment you turned them on.

From your picture, it is impossible to say what bulbs they use. We would need a picture of the bulb to tell for sure. If you remove the yellow lens, and look at the bulb, it should be pretty easy to tell how to remove it. Then you need to use an ohm meter and test the bulb. At that point...

You should be looking underneath the truck as often as you drain the tanks. What gain is there in adding a component that will require maintenance/add a failure point?

If you have not converted your GP supply to 12v, do NOT start the truck with any bad GPs in the truck. You will ruin the good ones. This is why we convert the supply voltage to 12v(eliminating the resistor). When this has been done, when a GP fails, it does not affect the others. All of this...

In what application? The H1 lamp was the first tungsten-halogen headlamp light source. It was introduced in 1962 by a consortium of European bulb and headlamp makers. This bulb has a single axial filament that consumes 55 watts at 12.0 volts, and produces 1550 lumens ±15% when operated at...

With no information and a few minutes effort, you could turn on your parking lights and simply pull one connector at a time apart. When the tail light goes out, there's the wire! Or you could look in the technical manual. It has schematics with wire numbers. All the wires have number tags on...

Great show.

No problem.

Yup

Here's your problem most likely.

I would suggest any of our paid site sponsors.

It is. It will work. I think I recall that the military actually used a similar relay originally for the GP system and changed to what they use now(for some reason). Without confirming and understanding why they did, I would not change to it. Maybe keep one as a spare and use if needed, but...

Let's shoot for Noon.

What is this? Please explain.

I have one and Surfdog has one(he is closer to you than I am) and I think he will sell his.