Van parked for 2 days-very humid weather. No issues before this. Speedometer goe

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Van does these things more so when it rains or is cold outside. on normal days i'm good for several days. Speedometer goes to 0 and then back to normal. Shift indication goes from highlighting D to all. Transaxle shifts up and down abruptly and RMPs jump ALSO I EXPERIENCE THE WIPERS ON THE CAR MOVING AFTER I TAKE THE KEY OUT. I CAN HEAR RELAYS ENERGIZING OFF AND ON(CLICKING)SOMETIMES WHILE I DRIVE THE WATER WILL SHOOT OUT THE WIPERS, THE RADIO, AND HEAT GOES OFF AND ON AND THE CAR GOES DEAD FOR A FEW SECONDS AND THEN COMES BACK TO LIFE ALL AT THE SAME TIME WHILE I'M DRIVING MY CODES ARE: P0305, P0706, P0884, AND P0888. I THING POWER WIRES ARE SHORTING TO OTHER COMPONENTS, AND I CHECKED VOLTAGE TO THE TCM ON WIRES 15, 16, 17, AND THEY ALL HAVE 12V, BUT THAT IN PARK. I DRIVE THIS VAN AND SOMETIMES ITS ONLY THE MISFIRE I CAN FEEL, THEN SOMETIMES THE VAN GOES CRAZY. WHERE DO I START SEARCHING FOR SHORTED WIRES?