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The MEP-802 and MEP-803, A1 volt regulators sometimes go bad. When they do, the Stator is often damaged. The troubleshooting diagram tells you to first test the stator. If you find that the stator is defective, naturally, you change it. So after installing the stator, you fire it up and presto! Another bad stator. Why? Because you fixed the symptom, not the cause. So to protect your stator, from a defective A1 volt regulator, and from destroying a second stator, (not cheap) you need to see if your MEP-802 and MEP-803 has been modified. In about 2007 the following PS magazine article was put out. The accompanying Volt Regulator test procedure came from TAACOM. In about 2009 or 2010 the military started to modify all existing MEP-802 and MEP-803's. But a lot never got done. Sadly, I cant find my copy of the Modification, but it follows the PS magazine article almost word for word, BUT it tells you to put a fuse in between Q1 AND Q2 to completely protect your stator from damage by a defective A1 Volt Regulator. This is a simple and cheap insurance for your generator. Later, should you find that a fuse to Q1 and Q2, (Quad Circuit) is blown, you can start on the real problem, the A1 volt regulator, and not have a unservable Stator to boot.
View attachment Testing 5&10 KW VR.pdfView attachment PS Mag May07_ 5-10KW VRfuse.pdf
View attachment Testing 5&10 KW VR.pdfView attachment PS Mag May07_ 5-10KW VRfuse.pdf