voltage

[hdm76]

when i start my 02 f 250 supduty ...the volt meter reads 12
volts. 40 seconds goes up to 14.5????? it seemed to start after i changed the glow plug relay!!!! replaced both alts..aswell..

[ianstew]

It's your glow plugs drawing amperage after the truck is started. It's normal.

[ford_trck]

everything is fine. The glow plug relay stays on up to 2 minutes once the engine is running. It draws so much amperage that you actually see your voltage drop because of it. Everything is fine don't worry about it.

[nccatfan]

Depending on how cold it is, I'd call that normal. Those glow plugs pull alot of juice whe they cycle.

[Fred Swanson]

As stated....it's normal, all my powerstrokes have done this...

[hdm76]

thanks..i thought it might be a problem...the lower alt. blew up so i changed the upper too.then i had hard starts and replaced the glow plug relay... so i dident know were i was going next thank alot