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James
James, Ford Technician
Category: Ford
Satisfied Customers: 3610
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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I have an F450 with a service body and i lost right rear

Customer Question

i have an F450 with a service body and i lost right rear turning signals. i have checked all fuses and relays, every thing checks out ok, also replaced turning signal switch. PLEASE HELP
Submitted: 1 year ago.
Category: Ford
Expert:  James replied 1 year ago.

Hello, if you aren't getting voltage but the fuse is good. The smart junction box needs to be reset. It will shut down the turn signal circuit if it detects an abnormal resistance. Service beds so weird things to the actual smart junction box. Reset with a scan tool and you will be working again.

Customer: replied 1 year ago.
your saying the PCM needs to be reset
Expert:  James replied 1 year ago.

The smart junction box needs to be reset.

Customer: replied 1 year ago.
Where is the smart junction box located
Expert:  James replied 1 year ago.

The smart junction box is where the primary fuse panel is inside the vehicle. The fuse panel is actually the smart junction box.