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I am getting some variations on my battery monitor from 12.3 V when the truck is not on, to 14.5 V when the truck is being driven. I decided to check each battery individually by disconnecting them to check their charge and found that the auxiliary battery is bad. Any recommendations for a...

I was scrolling through Amazon and came upon this programmer and was wondering if anyone had used it to update the modules on their trucks. It is cheaper than the Mongoose Plus.