The high-current fuses are coded as follows.
Fuse/Relay
Location
Fuse Amp
Rating
Protected Circuits
1
Micro Relay
Powertrain Control Module (PCM)
2
Micro Relay
Starter solenoid
3
Micro Relay
Wiper
4
Micro Relay
Trailer tow battery charge
5
Micro Relay
Fuel pump
6
Micro Relay
Trailer tow park lamp
7
Micro Relay
Upfitter #4
8
Micro Relay
Upfitter #3
9
Micro Relay
Modified vehicle and stripped
chassis run/start
10
ISO
IDM relay (Diesel engine only)
11
—
Not used
12
40A**
Modified vehicle and stripped
chassis run/start
13
30A**
Starter solenoid relay
14
40A**
Run start relay
15
40A**
Modified vehicle and stripped
chassis battery
16
50A**
Auxiliary A/C blower
2009 Econoline
(eco)
Owners Guide, 1st Printing
USA
(fus)
Roadside Emergencies
229