have to use either to start it. when it starts it only running on 2 to 3 cylinders. had glow plugs checked out, there Ok. After motor reaches operating temp it will start with no problems all day,leave it over night, And plugged in & the next cold morning it will not start.
2002 7.3 Warm weather starts great, cold weather will not start on 2003 Ford F-250 Super Duty
What about the solenoid that powers the glow plugs, common problem?
replaced its new. This morning after siting 3 days it would not start with either, tried for 10 mins & gave up. let sit for 20 mins then it started with no either, ran on 4 to 5 cylinders until it reach operating temp. starts great and run great.