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M939 Wiring /Lighting issue

texczech

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Texas
The local rural fire department has a M939 with Lighting issues- Headlights, tail & turn signals don't work. Where can I get a repair manual to cover this problem/diagnosis or any quick tips on where & how to check? Thanks!
 

Mullaney

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The local rural fire department has a M939 with Lighting issues- Headlights, tail & turn signals don't work. Where can I get a repair manual to cover this problem/diagnosis or any quick tips on where & how to check? Thanks!
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The TM's (Technical Manuals) are posted here. Free download. TM9-2320-272-24-4 has electrical diagrams with the full truck electrical on page 819. That page is attached below.

TM9-2320-272-24-4 Wire Diagram.jpg

The turn signal (SignalStat) will generally last forever - but everything out on the back of the truck goes through it - so that is a good place to look. Reading your post a second time mentions headlights, so that points more at the 3 Lever switch... Has anyone made changes to the lighting recently? Like maybe adding or upgrading to LED's possibly?
 

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Mullaney

Well-known member
Steel Soldiers Supporter
Supporting Vendor
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Charlotte NC
Might want to insure that personnel understand how to use the 3 lever switch.
Check in the dash 10 manual you can download I think.
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Good reminder @GopherHill
Here are the easy version of "Cheat Notes" for the 3 Lever Switch.

Light Switch Sticker.jpeg

Brake lights for example DO NOT operate if the lights aren't in the "Service Drive" position texczech .
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Micmada

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Florida
Make sure the ground/bounding is good. I play with HAM radios and I have the same truck and they tend to develop rogue current through the frame from one piece of electric to the other.
 
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