89 240sx SE Electrical Issue need HELP! Urgent.

[Omega47]

Just put in a digital cluster,cause previous owner decided to go analog..My car is an 89 240sx SE but has an SR20DET in it,i swapped the tach out so that works,the engine and saftey lights,temp and fuel gauges,work as well.Problems:Cluster illumination goes off once and a while,,,Interior lights do not turn on...Stereo does not work...Door open light stays on and flickers when doors are closed and car is on.Some insignia lights such as hazards or defrost are not illuminated...Auto seatbelt dont work unless key is to ON position...Clock lights up when i turn lights off...Clock shuts off and resets when door is opened...FUSES ARE FINEIm so frustrated atm... This problem has to be fixed asap.Any Help is greatly appreciated.

[rogoman]

Check the grounds.

[Omega47]

Which grounds? So many in this damn car,where do i look?

[chad_KAT]

check for opens / shorts / cross shorts. Get wiring schmatics and a DMM and you good to start diagnosing.