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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 F-250 with a 5.4L V8. I am having trouble

Customer Question

Hi I have a 2003 Ford F-250 with a 5.4L V8.
I am having trouble with the engine.
I can start the truck but when I turn the headlights on the truck dies.
If I push the brake the truck dies.
My turn signals flicker fast but if I push the brake pedal the signals stop flashing and the truck dies.
I had the alternater tested and it passed.
I had the battery tested but it was bad so I replaced it and am still have the same problems.
Submitted: 1 year ago.
Category: Ford
Expert:  Ray M. replied 1 year ago.

Do you have to boost the truck to get it started?

Customer: replied 1 year ago.
Nope, it fires right up.
It all started yesterday after I crossed some railroad tracks and the truck bounced and started this problem
Expert:  Ray M. replied 1 year ago.

What happens if you turn on the headlights and put the heater fan on high?

Customer: replied 1 year ago.
The rpms drops and dies
Expert:  Ray M. replied 1 year ago.

It sounds like you have a power supply problem, check the battery wire from the battery to make sure it is tight, then check both of the fusible links, one may be burnt and the other only having a few good wires.