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post #1 of 6 Old 01-31-2010, 06:50 AM Thread Starter
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Angry voltage

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..
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post #2 of 6 Old 01-31-2010, 06:57 AM
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It's your glow plugs drawing amperage after the truck is started. It's normal.
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post #3 of 6 Old 01-31-2010, 06:57 AM
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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.
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post #4 of 6 Old 01-31-2010, 06:58 AM
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Depending on how cold it is, I'd call that normal. Those glow plugs pull alot of juice whe they cycle.
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post #5 of 6 Old 01-31-2010, 07:10 AM
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As stated....it's normal, all my powerstrokes have done this...
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post #6 of 6 Old 01-31-2010, 12:04 PM Thread Starter
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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
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