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Generater blinking service code

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jmann7x:
I have a 7500k Onan Diesel Quiet Gen. I went to move the coach to outside and the coach batteries were about dead and I used the auxilary start and it still didn't start so I charged the coach batteries and it started. I went to start the gen and got a code 19(service code). I checked my house batteries and noticed they were extremely low on distilled water so I topped them off. No luck. The fuel pump operates but when I try to start I immediately get the blinking light. I am supposed to go on a trip to Tennesse saturday but I couldn't imagine traveling with no house air. I am guessing Cummins Onan will not be able to get me in but I am going to try and call tommorow. I also keep the RV plugged in. Please help my 8 year old daughter is so bummed out. :(  Happy 4th to you guys and thanks for any input. God Bless our service men and women!!

Alfa38User:
Just adding water to the batteries will not 'fix' them. They are likely quite dead themselves and will require charging.  It sounds like these batteries have been boiled by a poor (possibly a single stage) charging system (the converter).

It would be wise to  charge them fully then have them load tested. This can  likely be done at any good automotive parts store often at no cost. The results of the load test may indicate the batteries are finished and you may have to buy new ones.

Pusherpilot:
First check the batteries. I had  a similar problem and that was what it was.  If you have a good battery charger try that first, if you take the batteries to a shop to be tested they won't be able to tell you much if they are simply discharged.  How old are the batteries?  It's possible they are simply end of life.
Ron

jmann7x:
Thanks for the reply. The batteries are 3 years old. I have two 6 volts wired in series to make a 12 volt system. should i charge them hooked up together on the 12 volt system, or disconnect and charge them on 6 volt? i did load test them and they are close to weak but did not fail the test. 

Ned:
Treat them as a single 12V battery and charge them accordingly.  When you do replace them, replace both at the same time.

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