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Protected components
Fuse amp rating
Fuse or relay number
Powertrain control module.
20A
1
1
Emissions (MIL).
20A
1
2
Cooling fan.
20A
1
3
A/C compressor.
Engine brake.
Noise suppression cap.
20A
1
4
Mass air flow sensor.
Emissions.
Glow plugs.
Urea.
Compressed natural gas fuel control
module.
15A
1
5
Not used.
—
6
Not used.
—
7
Not used.
—
8
Not used.
—
9
Heated exterior mirrors.
15A
1
10
CNG relay.
—
11
Heated rear window.
40A
2
12
Not used.
—
13
Powertrain control module relay.
—
14
Horn.
20A
1
15
A/C clutch relay power.
10A
1
16
Rear heated window and heated mirrors
relay.
—
17
Not used.
—
18
Not used.
—
19
Supplemental air heater bank #1 relay.
—
20
313
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201710, Second Printing
Fuses