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2003 F250 5.4L V8 electrical issues


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Priornavy44
New User

Oct 11, 2020, 10:38 AM

Post #1 of 4 (611 views)
  post locked   2003 F250 5.4L V8 electrical issues  

My fuse box has power going to half of the fuse box when the truck is turned off. It is killing my battery. When I put a multimeter on it it is pulling over three volts. If I pull out the 35 fuse or the 41 fuse(both go to the instrument panel) it jumps up to over 7 volts. I have no clue what is going on and I need my truck. Can anyone give me a clue as to what I need to do?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 11, 2020, 11:16 AM

Post #2 of 4 (603 views)
  post locked   Re: 2003 F250 5.4L V8 electrical issues  

OK, first you need to take some electrical training before tackling a job like this.

Current draw is not measured in volts. It's measured in amps, specifically milliamps.

Of course half of your fuse box has power. It's supposed to. Many functions work with the key off.



BATTERY DRAW PROCEDURE


There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 30 to 40 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.

Note that the act of pulling fuses will often restart some timers so you may have to wait for them to expire if that happens



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 11, 2020, 11:18 AM)


Priornavy44
New User

Oct 11, 2020, 11:30 AM

Post #3 of 4 (597 views)
  post locked   Re: 2003 F250 5.4L V8 electrical issues  

Most of all of that has already been done. I removed the instrument panel and it dropped the draw to .54 v. No I haven’t had the electrical training needed, but that’s why diy guy. Thank you for the help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 11, 2020, 11:33 AM

Post #4 of 4 (593 views)
  post locked   Re: 2003 F250 5.4L V8 electrical issues  

OK, that response just proved you didn't listen to a word I said so I'll close this now and let you move onto another forum.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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