Headlight repairs – 24V R2 bulbs

So normally, when your vehicle blows a headlight bulb, you just go to your local auto parts store and get a replacement.

You open the hood, twist the fitting on the back of the headlight, replace the bulb and twist it back in.  No big deal.

But it’s not that easy on a Unimog.  First of all, the Mog Mahal is a former German Army Truck.

That means it runs a 24V electrical system.  Second of all, it does not use a standard 9004 or H4 bulb.  Nope.

It uses a 24V R2 bulb.  These have to be special ordered.

So here ‘s the blown bulb from the MOG compared to the new one I was able to source.

24V R2 bulb

Here’s the model I was able to find.

I sourced it from Susquehanna Motorsports.

http://www.rallylights.com/narva-r2-bulb-p45t-base-halogen-12v-24v.html

CP48894 – 24V – 75/70W – 2150 / 1325 Lumens

 

So how do you install the blub?

First you have to remove the frame around the headlight assembly.

Those two small screws on the sides of the frame come out and the frame comes off.

Then remove the six hex nuts from around the perimeter of the headlight.

Then carefully, tilt the lens assembly forward revealing the wires and connector.

You will see both the main halogen headlight bulb, and the smaller parking light.  Both of these bulbs are 24V.

Disconnect all wires.

The left and the right headlights had slightly different wiring for the parking bulbs.

On my truck, the brown wire is the ground or negative wire.

 

You can see the smaller parking bulb on the right. I ordered it from lightbulbs.com.  Osram – 4 watt 24 volt Miniature Bayonet Base #3930

To replace the main bulb, press and twist the grey metal cover counter clockwise.  It’s spring loaded and takes a fair amount of force to depress.

This reveals the R2 bulb behind it.

Pry out and swap out the bulb.  Reinstall the grey metal bracket, and reinstall the headlight assembly and the frame.

While I had the frames out, I sanded and repainted them.  The old paint was flaking off.

Then reconnect the wires, and reinstall.  Main light works!

And so does the smaller parking bulb.

Happy truck with both headlights working.


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