2009 Volvo VNL 630

Truck has Cummins ISX. I'm having electrical issues. Flip the turn signal today and the dash went dark - truck died. I turned the key off and started it again. Run rough. Cut it off and looked at the codes. Is anyone familiar with this on the LCM: Potentiometer Signal MID 216, PSID -, FMI 5? Recurring issue but seems to be getting worse. Also threw MID 216, PSID 49 , FMI 5 under the LCM. The ECU shows MSID 144, PSID 230 and FMI 4. Any guidance would be appreciated.

 

Thanks. I've had several mechanics look at the truck but I don't think the batteries have been loaded tested. Will do that on tomorrow.

 

Checked each battery and they are good. Alt is putting out about 14 volts, all nuts on posts are clean and tight. Any other suggestions?

 

No battery cutoff. Low voltage cables running to cab are disconnected.

 

It does seems like too much power is being drawn. The dash flickers (at times) when the brakes are depressed, turn signal flipped, head lights turn on, or a/c turned on. Everything in the battery is clean and tight. System is charging just fine. There's a disconnect (sometimes) between what the volts of mechanical components are putting out as compared to what the dash is reading. Sometimes on dash volts will drop to under 11 while the alternator is putting out 14. Have not been ever to see a constant pattern other, it's erratic.

BTW the dash was replaced and programmed last week by a shop. Was told for sure that was the problem.

How do you trace the cab power circuit?