Electrical System Shuts Down.

Hi Knowledgeable Mechanics,

The electrical system in my 2007 Volvo VNL 670 with a D12 engine shuts down every ten minutes or so. The system shuts down both when the engine is running and also when the engine is not running but the key is turning on and the electrical system is on. I installed a new egr cooler and valves but I don’t think it is related. Any ideas would be greatly appreciated.

The Codes are:

mid 128 sid 230 fmi 5- idle validation switch electical fault inactive
electrical fault inactive
idle validation switch electical fault
mid 144 psid 205 fmi 9
mid 144 psid 230 fmi 4-
road speed data erratic inactive
road speed communication error inactive
sae j1939 data link data erratic inactive
engine oil pressure value to low inactive
engine oil pressure electrica fault
mid 128 pid 100 fmi 3
mid 128 pid 84 fmi 9
mid 128 pid 171 fmi 9
mid 128 sid 146 fmi 5

Thanks for your help,

Jake