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2003 F250 5.4L V8 electrical issues Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Truck Repair>> Truck Repair Advice Priornavy44 New User Oct 11, 2020, 10:38 AM Post #1 of 4 (1896 views)      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 Oct 11, 2020, 11:16 AM Post #2 of 4 (1888 views)      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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 (1882 views)      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 Oct 11, 2020, 11:33 AM Post #4 of 4 (1878 views)      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.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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