'99 F350 underhood fuse 25 - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 10 (permalink) Old 02-07-2015, 07:32 PM Thread Starter
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Question '99 F350 underhood fuse 25

I am loosing power to my fuse 25 underhood and the truck dies when it drops out. The truck starts and runs great just as soon as the power comes back. I have not been able to locate a wiring diagram that shows where the fuse gets its power from.


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post #2 of 10 (permalink) Old 02-07-2015, 11:06 PM
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Give me the circuit and I can shoot you a picture of a 2000 diagram. There can be differances from one year to the next but it might be 100 percent accurate or just part of it.
Let me know, I'll check in tomorrow. It's way too late for schematics.
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post #3 of 10 (permalink) Old 02-08-2015, 06:50 AM Thread Starter
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sorry wrong number its 24 but its labled as power distribution box
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post #4 of 10 (permalink) Old 02-08-2015, 03:21 PM
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Ok, what is in the circuit or what number is it? What does it feed.
The circuits in the book are broken down in components and circuit types.
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post #5 of 10 (permalink) Old 02-08-2015, 03:35 PM
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Does this look right? Fuse for the pcm relay?
A lot of times that fuse blows from the fueł bowl heater shorting out. Unplug it's connector, replace the 20 amp fuse and see if you are good.
You can get a new updated heater element from Diesel Orings.com
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post #6 of 10 (permalink) Old 02-08-2015, 05:14 PM
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Nick could be on to it, but the fuse that powers the fuel heater is on the coil side of the PCM power relay. It's #30 (30A) under the dash. I've had that issue (see this thread: http://www.thedieselstop.com/forums/...-fixed-239318/)

If it's Fuse 24 in the Battery junction box, it's more likely a short in a wire that's on the contact side of the PCM power relay. That relay feeds the following items:
PCM
Transmission
Fuel Pump (via the fuel pump relay)
Brake Pressure Switch
Injection Pressure Regulator
Glow Plug Relay
Intake Air Heater Relay
The last three are on the engine, so susceptible to vibration causing chafing and shorting.

Check your engine harness to see if there are any spots shorting against the engine.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #7 of 10 (permalink) Old 02-08-2015, 05:28 PM
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Thnx Kevin, I had the 24 fuse in junction box for the pcm relay and was mistaken about the heater being on that side rather the heater being on pcm fuse in fuse box. My bad
That is the battery junction box.
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post #8 of 10 (permalink) Old 02-08-2015, 06:55 PM Thread Starter
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thanks for the info im suspect its going to be in the engine harness the problem started when the engine was swapped and has kept getting worse


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post #9 of 10 (permalink) Old 02-19-2015, 07:37 PM Thread Starter
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I wanted to let everyone know what I found so maybe it will help
I checked my wiring harness twice end to end repaired multiple bare spots to still have truck dieing and not starting back for anywhere from 2 min to 20 .
I finally pulled PCM to check connections and found a superchip plugged in.
I removed chip truck ran perfect (little less power now) but doesn't shut down.


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post #10 of 10 (permalink) Old 02-19-2015, 08:23 PM
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Glad you found out what was going on. Sound like that chip had a heat issue. Checking for a chip and removing it should always be the first step in troubleshooting.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
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