I am a new 350 z used car owner, stock, good condition for a month, 136K mi. Now: random electrical mysteries occurring. Instrument cluster with key on/engine runing: CEL, ABS, BRAKE, AT CHECK, TCS OFF, SLIP. Also Tack drops off to zero after start, has a pulse to 750 during start. Intermittent: P, D, N, R indication, wipers, MPH reading, hazard lights, turn signals, no high beam ind. TCS on/off sw has no effect.. T/S so far, Shook connections at BCM, disconnected ABS connector, errors remained, reseated ABS connector, no change. removed neg Batt terminal for 30 Minutes. Reinstalled and indications norm for .5 mi drive. When problems came back, drive train grab, didn't feel right. Returned home to park it. Thought: its been WET here in Seattle, thinking that might be shorting something. Is there a chance wet connector on Tx or wheel speed sensor that may induce these syptoms?
Thanks in advance for your input.

 

My guess would first be low battery voltage. Try a fully charged new one. One thing that is common with all those systems is the battery.