Mep003a D.C. Charging system

[Lukes_deuce]

Hello everyone, looking for some advice on the D.C. Charging system on my mep003a. The unit runs and operates as it should besides charging the batteries. I read the thread on checking the D.C. System and have come up with the following findings. I'm not sure if the stator is bad or the regulator.

With the unit off, I have 24.5 volts at the regulator. When I start the unit, there is no change in D.C. Voltage. Now I know my fuse is bad as well and I removed that for the time being. Now the check list says check the output from the stator. I have 41.5 to 42 volts AC coming from the stator. Now I'm not an electrical engineer but my friend is. He said that should be an ok output to the regulator since there is no load from the regulator. Does this seem right? I would like to check all my bases before I start throwing parts at the machine. Do stators usually go bad? I know the unit has sat for a few years and was run without batteries as well. I'm hoping it's just the regulator. Let me now what you think. Thanks!

 

[Triple Jim]

It would be best to replace the fuse to start with. The regulator output may be a bit erratic without a connection to the battery. Then check the regulator output with the generator running and see what you get. If the battery is low, it could take a few minutes to see the voltage coming up significantly.

 

[Lukes_deuce]

Hey Jim, I had my genset connected to my 5 ton at the time of testing. No change in voltage with or without batteries when the set was running.

 

[Triple Jim]

Without the fuse, the regulator is not connected to anything, including a battery. You said above that the fuse is removed.

 

[Lukes_deuce]

Makes sense now! thanks for explaining. What size is the fuse?

 

[Guyfang]

30 Amp. Do you have the manuals download for this generator?

 

[Lukes_deuce]

Thanks Guyfang. I have looked through the TMs on here. I'm still learning the machine. My fuse holder was smashed when I got the genset, so I never knew there was one until I looked in the TM. I'll wiring in a fuse tonight and see what type of reading I get. Thanks for the help!

 

[justacitizen]

ok a shameless plug. if you need a regulator then replace with one of triple jim makes. better than original in my opinion

 

[Guyfang]

In all the time I have worked on this model gen set, I have only seen one, count that again, one, stator bad. This part is built to last. If the fuse dosent fix it, then it's the DC regulator. I would bet a large sum of money on it. But check it. Nothing is 100% in this life.

 

[Triple Jim]

My money is on the fuse fixing the problem. I don't use a 30A fuse in mine though. The charging system isn't good for more than about seven amps, so a 15A fuse should handle the job fine. It's not a critical thing though.

I appreciate your endorsement, justacitizen.

 

[Lukes_deuce]

I went out last night and wired in a new fuse temporarily. After a few attempts to start her up at 27F, I did get some readings. At the wire with the red marking, I had 26.6 volts compared to a reading of 25.4 volts at the batteries. Stator readings were 27.2 to 27.4 volts. Seems that the system is working. Thanks again for all your help!

Triple Jim, Ive heard of your products and their quality. If I need any parts for my generator, you'll be the one I buy from. Thanks for your response and advice.

 

[Triple Jim]

I'm glad the fuse was the problem. The voltage will probably keep climbing slowly as you run the generator more. It should not go over about 29 or so.

Thanks, but all I have is AC and DC regulators for the 002A and 003A. Others here can often supply parts at reasonable prices if you need any.