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Got it. Great summary. Thanks. If only I had a responsive Speed control module, it would be great. i took my 2 old modules and stuck them under an incandescent light bulb for a week. They stayed nice and warm in hopes that any moisture inside the potting would find its way out. I know these...

Maybe I didn't drink enough coffee this morning, but where is this instruction sheet? I looked in the manuals and did not find anything.

I will check all my connections. From the above comments, I understand that the controller itself may be at fault. I read from the early posts that getting a new unit from the manufacturer was crazy expensive and you had mentioned building something yourself. Have you had a chance to pursue...

This started all of a sudden. The governor just appears to lose power and fall in between overriding the mechanical governor or shutting down. When in this condition, the magnet does not capture the target, and the governor does not override the mechanical governor. When I turn the switch to...

The mechanical governor and the plate are all in good shape. No loose parts. There seems to be an event, which causes the voltage on A/B/C to drop down to 150 volts. When that happens, the speed load regulator becomes unresponsive. Seems to happen more often in cold weather. I'm thinking...

Hello: Trying to diagnose my MEP-831a. I had this thing running like a top. All voltages at the speed controller were in spec. Suddenly, unit would not stop with the switch any more. Voltages at A/B, B/C, C/A read 152 volts. Engine runs slowly. No problem at the fault lights. This is an...

Thanks for sending. This is the document I was talking about. There was an earlier version which noted the fuse as 250 volts instead of 600. I was wondering why there was a difference and I think I did get my response above. Pete

Reading the different publications I found regarding the addition of a fuse in line with terminal 8 of the voltage regulator: Some pubs require a 250 V /3 amp fuse and other require a 600 V/3 amp fuse. Does anybody know which is the best to use? Does the 250 volt fuse blow out too easily...

The troubleshooting guide in the Technical Manual is really good for the fried Quad windings problem. Resistance accross Q1 and Q2 is supposed to be .9053 to 1.224 Ohms. My reading was .02 which indicated a problem. When I removed the stator, I could see there was a section of the winding on...

Is there any way to determine if the FET Transistors are bad? Can they be tested? They both looked good when I did the diode repair, but I'm not sure I would know a good one from a bad one.

There was a guy on ebay selling stators for the smaller 802A. On one of the pictures he posted I recognized the part number for the stator for the 803A. I contacted him to confirm and ended up making a deal with him for $450 shipped. I had found a rewinding shop in California who wanted $900...

I definitely had a bad stator. Q1 Q2 was burned to a crisp. I found a new old stock stator and it gave new life to my genset. I had replaced 2 diodes on the voltage regulator board which were fried. I also installed the fuse, I think that's what you were talking about in your response to...

Update: Installed new stator. Generator now produces voltage on all 3 legs. GREAT. With voltage potentiometer cranked up all the way I only get 190 volts across 2 legs. Frequency is good at 60 hertz. Voltage is stable. I had changed the diodes in the voltage regulator. Does anybody...

Good for you. Mine is still DOA. Stator is shot. Found a NOS replacement but its too hot to work on this project. I replaced all the diodes in the A1 regulator. A couple of them were all burned up. Now I need to find an old electric stove to make a load bank tester. Sounds like a trip to...

The resistance readings are normally done with the generator turned off. The voltage measurements are made with the unit running. Work safely! Pete

The quad winding is embedded in the generator stator, Part # 220-4236-02. (Item 43 in the parts book page 24-1) The excitor stator part #220-4265 (Item 11in the parts book page 24-1) connects to the F1-F2 terminal board which in turns is connecting to terminals 5 and 6 on the A1 voltage...

Hi Chris. Thanks for your response. I've read your approx. 35 page thread on the MEP-831a. How interesting. I have two 831a gensets waiting for a minor overhaul. Just stared up one this weekend. Love these small Yanmar's! Mine started right up and purrs like a kitten. I mis-stated the...

Thanks for sending the TB I had found it on this site, I believe and first discarded it as it indicates that the condition is no volts no hertz. I have 20 volts and 60 cycles. Upon further investigation I realized that the condition described is exactly what is going on. Burned diodes, no...

Actually, I downloaded all of the manuals, Operation, Parts, Engine, 2, I believe and the technical manual and the technical bulletin. I read the technical manual cover to cover and then proceeded to troubleshoot the unit. I completed every test in the book, and I can put the results here if...

Greetings from a Newbie. Been lurking around for a while and I've learned a great deal about MEP generators from your posts and comments. I recently bought a MEP-803A from GL which did not have the circuit protection fuse. 2 diodes in the voltage regulator were burned out (now replaced)...