F 450 4WD Super Duty V10-6.8L VIN D (2004)
2.
With the ignition key off, use a non-powered test light from battery positive terminal and test Pins 1, 2, and 3 for a short to ground. Pins 1 2, and 3
must not have good continuity to ground (no light). Pin 4 must have good continuity to ground (bright light - same as battery). (Figure 4)
a.
If Pins 1, 2, and 3 pass the continuity test (no light), the concern is with the trailer wiring.
b.
If Pins 1, 2, and 3 fail the continuity test (light), locate and repair the concern in the vehicle's wiring.
7-PIN CONNECTOR 2005-2006 VEHICLES
1.
Check Fuses F1.9 and F1.20 in the battery junction fuse box, located in the engine compartment, left rear side and Fuses F2.38 and F2.1 07 in
central junction fuse box, 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.
2.
With the ignition key off, remove Fuse F1.20 in the battery junction fuse box, located in the engine compartment, left rear side.
3.
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 (bright light - same as battery). (Figure 5)
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.
Replace fuse F1.20 after identifying repair.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.