Freightliner electrical problem

I have freightliner columbia 07 detroit s60. Tractor abs light comes on on dash "abs 136 code", whet it shutdowns the engine. I turn of the key wait couple seconds turn it back on , start the engine and after awhile it shutdowns engine again. The voltage on dash drops to 0.0v and after awhile backs to 14v. I was at the shop , they checked battery connections, ground, starter wiring everything clean, alternator charges fine too. I brought truck to freightliner dealer, they just hooked laptop to see check engine codes but didnt find anything. Does anybody had anything similar or have any idea what this could be?

 

that happens in rain or snow, when weather is humid

 

Can tractor ABS shutdown the engine?? I thought AbS is related with brakes

 

Can you help me to get ecm pins diagram ? so i could check if ecm gets power from batteries

 

Thank you for your help