F 250 4WD Super Duty V10-6.8L VIN Z CNG (2003)
2.
With the ignition key off, use a non-powered test light from battery positive terminal and test Pins 2, 3, and 4 for a short to ground. Pins 2, 3, or 4
must not have continuity to ground (no light). Pin 1 must have good continuity to ground (bright light - same as battery). (Figure 2)
a.
If Pins 2, 3, and 4 pass the continuity test (no light), the concern is with the trailer wiring.
b.
If Pins 2, 3, and 4 fail the continuity test (light), locate and repair the concern in the vehicle's wiring.
7-PIN CONNECTOR 2003-2004 VEHICLES
1.
Check Fuses F2.6, F2.38, F2.39, and F2.115 in the central junction fuse box, located under the dash panel, left hand side.
a.
If the fuses are okay, do not continue with this procedure. Follow normal diagnostics to determine if the issue is in the vehicle or trailer
wiring.
b.
If a fuse is found open, proceed to Step 2.
2.
With the ignition key off, use a non-powered test light from battery positive terminal and test Pins 1, 4, 5, 6, and 7 for a short to ground. Pins 1, 4,
5, 6, and 7 must not have continuity to ground (no light). Pin 2 must have good continuity to ground (bright light - same as battery). (Figure 3)
a.
If Pins 1, 4, 5, 6, and 7 pass the continuity test (no light), the concern is with the trailer wiring.
b.
If Pins 1, 4, 5, 6, and 7 fail the continuity test (light), locate and repair the concern in the vehicle's wiring.
4-PIN CONNECTOR 2005-2006 VEHICLES
1.
Check Fuse F1.9 in the battery junction fuse box, located in the engine compartment, right rear side and Fuse F2.38 in the central junction fuse
box, located under the dash panel, left hand side.
a.
If the fuses are okay, do not continue with this procedure. Follow normal diagnostics to determine if the issue is in the vehicle or in the
trailer wiring.
b.
If a fuse is found open, proceed to Step 2.
