Should both wires leading to the coil on plug have positive current

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My 2000 ford 350 work van broke a serpentine belt and over heated after i fixed the belt the van wont start I have a lot of codes ,PO 305- PO 306-,PO 308- PO 353- PO 356 I don't know if over heating cased the coils to go bad but when I tested the wires leading to the coils they both had positive current I assume one wire should be pos and on neg I was trying to check for spark and didn't get any so i checked the power to the coils some have power on both wires and some have power on only one wire What make me confused is I started it after it cooled down to move it for the tow truck and it started no problem but after that it just cranks with no start the battery did die so i'm jumping it to get it to turn over Thank you for any help