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Thanks for the suggestion, that's exactly what it was. Whoever worked on the set before me labeled the wires with a + and - correctly but then installed them backwards on the gauge. I ran it for a half hour, drawing as much power as my house could ask for, and it all seemed to work fine and the...

Thanks for the reply. I just got the alternator back and as many suspected, the diodes and rectifier needed to be replaced. I just got the repaired alternator installed and now the ammeter never goes positive after the start. Just after the start it's maxed out on the negative side of the gauge...

Thanks for the replies. I just had someone start the generator for me so I could immediately measure the voltage at the alternator and i got 25.3V, slightly higher than the other day but not where we want. I will try popping CB1 and see if I get sparks when running the negative post.

How long does the voltage typically stay above 27V? Longer than the 30 seconds it takes me to open the door and get the voltmeter hooked up, or should I have someone watching the voltmeter immediately after I get it started?

Here are some pictures

I just went out and ran those tests now. During the cold cranking the battery dropped from 12.5V to 11.5V and then returned to 12.5V once i stopped the crank. I then started the engine and measured DC voltage across the positive and negative terminals on the alternator and got 24.7V. From what...

I do not, this is the first thread I have created. I have just read a lot of the other threads with people having similar issues to try to figure out what my problem is.

Yes, I used that exact drawing as I was replacing the alternator to make sure the wiring was correct.

I did have my local AutoZone charge the batteries and test them, and they said they're good.

Good afternoon, I have a MEP803a that won't charge its batteries. If I charge the batteries manually I am able to start and run the set but the ammeter on the panel never goes above 1.5A. When I shut the generator off I need to physically disconnect the battery closest to the alternator...

Bill, Just curious if you got back to work on this and if you have had any luck with it. I am currently having the same issue and suspected it was an issue with the alternator/diodes so I replaced them but I am still not getting more than +1A right after starting the set. Hopefully you are...