Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to just answer. This is not good. It is not the alternator causing this. The ECM, PCM, and possibly the instrument cluster has been permanently damaged due to the reversed polarity when the battery was connected backwards.. The fuel injection pump may have also been damaged. There may have been other control modules that were damaged also like the ABS, Air bag module, etc. You will need to have a dealer's scan tool connected to the truck and see how many control modules were damaged and start replacing them one by one. Reversed polarity is almost always certain death for the vehicle's electronic control modules. I know that you do not want to hear this, but I have to be honest with you. Get the truck to the dealer or a reputable auto electric shop and have them diagnose how many modules were damaged.
I hope this information helps, and let me know if you need further assistance with this.
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I have to drive for about 2 hours fot a Chrysler training class, but will call you when I get there.