Hello I have a e99 f350, driving into town the other day bashing threw 4 to 6ft snow working the truck pretty hard all the light's dimmed and I power floored doing my be 10mph from 30mph before, volts gauge dosnt drop did this off and on maybe 30 seconds once I got to plowed roads it was dim all the time kicked it into 2 wheel and could do 50 mph max starts good it was vary cold -10.think my glow plugs came on or is there a bad connection or solinoid you could piont me to , also tranny would not down shift on its own and would not gointo 4low. she ran fine back home and has ran good since all thow the head lights are way dimmer high or low. thanks for the help fte is great

 

I could sure use some help, what would cause all the lights to dim, cause power issues but show good volts,start good -5 this morning? thanks

 

i would start with a digital volt meter, check to see if you are getting 14 volts or so at idle, the gauge in the truck is pretty useless.