2000 Dodge Ram shuts off while driving

I hooked up a battery charger to it and things went wacky , the abs ,brake , and check engine light are on , the transmission would'nt shift unless i let off the gas ,the tranny reset it self but now there is no speedodmeter and it stalls out every once in a while at freeway speeds and at low speeds,it still has power but won't run like it has no gas it'll turn over but won't start I let it sit for a little and it starts up no problem.a friend had a code reader and said the abs module under the hood went bad to explain the abs light and said that some speedodemeter module inside the tranny went bad to. does it sound like it is a fuel pump problem or maybe in the tranny or something! can anyone help anwser this thank you