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Generator overcharging
The M939 series trucks use the alternator as pictured. The aforementioned instructions apply to that type of alternator, whatever the vehicle. There could be several reasons for a battery to come apart. If the electrolyte in one or more cells is low, the battery can short out. That can create...- Scrounger
- Post #11
- Forum: M939 series 5 ton trucks
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Generator overcharging
If you have to replace the regulator the easiest way is on the bench. Remove the wires and cable from the unit, paying attention to how they are installed. Remove the six screws that hold the regulator on the back of the alternator. Use a punch, drift, or chisel and a hammer to tap off the...- Scrounger
- Post #7
- Forum: M939 series 5 ton trucks
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Generator overcharging
The engine has an alternator. If and or when the regulator fails, it can cause the symptoms described. When the alternator is overcharging the batteries, the electrolyte will boil, and the smell is the sulfuric acid boiling away. That isn’t good. The regulator is mounted on the back of the...- Scrounger
- Post #2
- Forum: M939 series 5 ton trucks