06 Columbia 475 C15 Acert voltage problem

Hi there,

Our truck has started to have severe voltage issues. It runs at 14V and then straight up to 16V. Once its at 16V it will not go back down. We've restarted it tried cleaning all grounds(suggestion from Freightliner), even sprayed Alt with WD40(hey in -10 deg its a shot at heat).

Everything turns off at 16V, lights heat radio etc all internal functions.. Its started a new symptom about 30 min ago.. restarting the computer(all warning lights come on etc) while truck is running.. It also has created an intermittent fuel problem where it doesnt seem to be getting fuel and yesterday it turned itself off while in gear.. luckily we were only going 20kmh at the time..

The computer reboots itself while truck is running every few sec.

It ran ok for a while shut it down and once started its right back to 16V.

Oh the wipers turn themselves on for about 30sec to 1 min after turning on the truck after its been shut down for a period of time.. dont know if thats anything to do with it, but its not the fuses(replaced them all)..

Replaced alt a month and half ago with a rebuild, but could this be a dying computer or a bad rebuilt alternator with a bad regulator.

any ideas would be great.

We need HEAT! (if only for a moment)

thanks