Ford F-650 2001 Owner's Manual page 152

Roadside emergencies
Relays
The relay box is located on the rear crossmember near the rear bumper.
Air Brake Trailer Tow Relays (if equipped)
R1
TRLR
RUN
RELAY
R2
TRLR
STOP LP
RELAY
The relays are coded as follows:
Fuse/Relay
Location
1
2
3
4
5
R1
R2
R3
R4
R5
R6
R7
R8
** Maxi Fuse
152
R3
TRLR
MARKER LP
RELAY
R4
TRLR
TAIL LAMP
RELAY
Fuse Amp
Rating
30A** Trailer Tow Run Feed
30A** Trailer Tow Park/Marker Lamps
30A** Trailer Tow Stop Lamps
30A** Trailer Tow Turn/Stop Lamps
— Not Used
— Trailer Tow Run Relay
— Trailer Tow Stop Lamp relay
— Trailer Tow Park/Marker Lamp Relay
— Trailer Tow Park/Marker Lamp Relay
— Not Used
— Not Used
— Trailer Tow Left Turn/Stop Lamp Relay
— Trailer Tow Right Turn/Stop Lamp Relay
R5 R6
NOT NOT
USED USED
R7 R8
LH RH
TURN TURN
Description
1
30A
2
40A
3
30A
4
30A
5
NOT USED