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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 2000 f550 7.3l diesel, my headlights work when the

Customer Question

I have a 2000 f550 7.3l diesel, my headlights work when the truck is off or keys is I the accessory position and the go out once I start the truck. I've replaced the headlight switch and the ignition switch module today but still no luck.
JA: The mechanics have tons of experience in that area. Are those all of the "symptoms"?
Customer: Yes and the marker lights stay on when it is running
JA: Anything else I can tell the Ford Mechanic before I connect you two?
Customer: No that's it, thank you
JA: Got it. Let's get this figured out. I'm sending you to a secure page on JustAnswer so you can place the $5 fully refundable deposit now. While you're filling out that form, I'll tell the Ford Mechanic about your situation and connect you two. You'll be on the road in no time.
Submitted: 1 year ago.
Category: Ford
Expert:  James replied 1 year ago.
Hello, while running will the high beams work?
Customer: replied 1 year ago.
No, no headlights at all
Expert:  James replied 1 year ago.
do you have a multi meter to test for power?
Customer: replied 1 year ago.
Yes, but I'm not sure why voltage or current change or matter if the lights are fine until the motor is started.
Customer: replied 1 year ago.
Is that it???
Customer: replied 1 year ago.
Why is nobody answering my question?