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Two things........double check the cables to be sure you got them hooked up correctly AND be sure you didn't drop a cable down out of sight that didn't get hooked up. Then be sure that you engaged the battery disconnect solenoid switch again as that will go to the "store" position when power is removed after you take out the batteries. Those are the two most common reasons for this. Attach a photo of the batteries and cables to your post so I can see it, if you still have nothing once you do this. I may be able to pick out the problem. Red cables should be positive and black cables should be negatives. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee and expected. I will make a phone chat option available for you as well in case you feel that would be more helpful.
Then the generator lead is either dropped down and not hooked up OR on a negative terminal instead of the positive terminal. Or there could be another issue with the generator that has nothing to do with the batteries. Did it work before you changed them out? IF so, then it has to be a cable issue. Attach a photo of them to your post using the paperclip icon.
The generator cable usually doesn't go through a solenoid, but directly to the generator. Large red cable. Perhaps you can trace it back to see which one is for the genset.
Does everything else work and just the genset isn't powered up? IF so, then you must have that cable either disconnected or on the wrong terminal. So easy to drop a cable down out of sight when you change these out. I have done it myself.
Just checking back in to see if you were able to get this resolved o.k. or if you needed more input from me?