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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have a 2003 ford excursion 6.0l diesel. i keep blowing

Customer Question

I have a 2003 ford excursion 6.0l diesel. i keep blowing fuse 116 disconnected everything from the ficm to the fuel pump to the glow plugs with no sucess, and without the ability to get the correct wiring diagrams to chase down the circuits im at a loss.
JA: Okay, I'll connect you to the mechanic to see about that diagram for your Ford Excursion. Before I do, is there anything else you want him to know?
Customer: do you need any additional info by way of the vehicle?
Submitted: 2 months ago.
Category: Ford
Customer: replied 2 months ago.
it seems to be more prone to have issues when ive been driving for 10min or more
Expert:  david craig replied 2 months ago.

Hi Im David, thanks for visiting the site. Please allow me a few minutes to get that information for you. thanks

Expert:  david craig replied 2 months ago.

Is it fuse 116 in the central junction box?

Customer: replied 2 months ago.
yea the one under the dash
Expert:  david craig replied 2 months ago.

goes right to the ignition switch

Customer: replied 2 months ago.
i would but i currently have babies crying and that gets annoying fast. I am a mechanic myself just never had any dealings with the small diesels
Expert:  david craig replied 2 months ago.

diagram

Customer: replied 2 months ago.
i put an amp clamp on the battery cable and shorted across the posts and it drew about 60 amps
Expert:  david craig replied 2 months ago.

just ignore the pop ups. thats not me

Customer: replied 2 months ago.
I have diagrams 26-1, 26-2, and 26-3. the only thing i can think of is the ficm is drawing a huge load when it gets heat soaked
Customer: replied 2 months ago.
but since i normally work on gasoline powered whatever and not diesel i figured id ask someone who knows a little more than myself
Expert:  david craig replied 2 months ago.

you're on the right track

Customer: replied 2 months ago.
could a bad ground to the ficm housing cause this problem?
Expert:  david craig replied 2 months ago.

it could but this circuit goes a lot of places

Expert:  david craig replied 2 months ago.
Customer: replied 2 months ago.
the fuel heater is currently disabled, both the fuse and relay are in the cup holder
Expert:  david craig replied 2 months ago.

ends up here

Expert:  david craig replied 2 months ago.

are you there?

Customer: replied 2 months ago.
I am, was just poking around under my dash with that new information
Expert:  david craig replied 2 months ago.

my bad.

Customer: replied 2 months ago.
where is that module located, i have the ficm on the left valve cover and some other module on the front of the right cover next to the alternator
Customer: replied 2 months ago.
The IDM that is
Expert:  david craig replied 2 months ago.

rear left valve cover

Expert:  david craig replied 2 months ago.

you are probably calling it an ficm

Customer: replied 2 months ago.
there is a module that mostly covers the left valve cover. how big is the IDM
Expert:  david craig replied 2 months ago.

location

Customer: replied 2 months ago.
This is what my engine looks like on the drivers side
Expert:  david craig replied 2 months ago.

ok, well apparently my drawings are incorrect. I will opt out and let someone else chime in. good luck