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Just wondering if you put new batteries in first? What other things have you done here in the way of starting to use this again. Sitting that long isn't good for these.
This can be a number of things and hard to diagnose from here. I will go ahead and opt out of this as there may be a tech here that has more experience in this sort of problem. They come and go so hopefully someone will take this. And no module in that area that I have ever seen. Bad grounds can lead to this sort of problem, especially at the chassis.