257b3

Afternoon everyone, i have a 257b3 w/ a wiring issue i believe. Backstory.. doing a engine swap. swap is completed and upon start up everything was good. after the unit ran for a few minutes and once i started to go up on the throttle i got all of my left hand lights active on the upper left panel. (oil pressure, hydraulic filter, water temp so on so forth.) This was last week at COB. Unit sat over the weekend and now my brand new battery i installed with this engine is totally dead. drained to 4.3 volts this morning. so over 3 days it lost for simple terms almost 10 volts. so there is power being pulled from somewhere. so my question to the forum is there a plumbing/wiring diagram that shows my volts/resistance requirement to sensors; harness. going through each connection point and testing to hopefully find a break somewhere SN- B7H02031