Low Voltage Reading
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Joined: Dec 2004
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Low Voltage Reading
I bought an used Ford F250 7.3 Turbo Diesel a few months back. The alternator went out few weeks ago. I bought and put in a new alternator. I noticed that the voltage reading is very strange. Below is the voltage reading:
+ Power off - 13.6V
+ Key to on/start possition - 11.xV
+ Start the truck - 10.xV at the beginning
After a minute or two, the voltage jump to 14.x. Is it normal to have the low voltage reading when you first start the truck? Is there something wrong with the truck? Any help would greatly appreciate.
+ Power off - 13.6V
+ Key to on/start possition - 11.xV
+ Start the truck - 10.xV at the beginning
After a minute or two, the voltage jump to 14.x. Is it normal to have the low voltage reading when you first start the truck? Is there something wrong with the truck? Any help would greatly appreciate.
Posting Guru
Joined: Feb 2004
Posts: 2,248
Likes: 1
From: Elverson, PA
I have an Autometer volt gauge - and that's about how mine reads!! As far as I know - the low voltage on start-up is your glowplugs pulling current - and they do stay on for a little bit after you actually start the truck - so I'd say you're fine!
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