Yet Another Question.
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Junior User
Joined: Oct 2013
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Yet Another Question.
I have a 1999 ford F-250 7.3 4X4 and the battery light will flicker/slash on and off in the morning (I just got the truck and the guy said it was a new alternator) and the 4X4 light will flash driving down the road randomly Any ideas guys? I already did the normal stuff check cables and connections on the battery and alternator
Fleet Mechanic
Joined: Jul 2011
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as for the batt. light I would monitor voltage one of those ones that plug into cigg. lighter port from Walmart or Internet, voltage after batt. recovers from glow plugs [ couple minutes ] should be slightly above 14 volts,mines 14.2, getting batteries tested would be good. dont have any experiance with 4x4 light diagnostic.
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@crop harvester gives good advice, Hoss.
How old are the batteries? New-new, last winter, 1999?
What voltage do you have across the battery before you crank it? After you start it but before you drive it? After you've driven it 10 miles or so? (Drive it!? Yeah, I know; it's a dirty job but somebody's gotta do it
)
I recently read somewhere that some 4x4 indicators run off the PCM. I suspect that's the case with your '99 and that the PCM is fussing a little bit because the voltage is a little low immediately after you start the truck.
How old are the batteries? New-new, last winter, 1999?
What voltage do you have across the battery before you crank it? After you start it but before you drive it? After you've driven it 10 miles or so? (Drive it!? Yeah, I know; it's a dirty job but somebody's gotta do it
)I recently read somewhere that some 4x4 indicators run off the PCM. I suspect that's the case with your '99 and that the PCM is fussing a little bit because the voltage is a little low immediately after you start the truck.
Last edited by broke vet; Oct 6, 2013 at 12:58 AM. Reason: Typo
Elder User
Joined: Sep 2012
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From: Philly, PA USA
@Hoss... do you have longer cranks to start in the morning? Maybe sign of battery(ies) getting weak. I agree with the rest of the above statements but rather than checking batteries in truck... pull each out and load bench test them. Checking them in the truck may give inaccurate readings. That can be done for free (if you pull out batteries yourself) at Advance parts stores for instance.
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We can easily have you throw a couple thousand dollars at the truck, Hoss, and not fix the problem. Or we can have you make a few tests, precisely locate the problem, and send you on your problem-free way for a tenth of that. Or less, possibly.
Right now what we know for sure are the following facts:
Right now what we know for sure are the following facts:
- The charge and 4x4 lights start blinking immediately after you start the truck
- The lights go out once the truck warms up
- The previous owner says the alternator is new
- The cables and connections have been verified as sound
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