No Crank/No Start, Discharged Battery, Battery Drain

Buffer Copy Email Facebook Flipboard Hacker News LinkedIn Messenger Mix Pinterest Print Reddit SMS Telegram Tumblr X VK WhatsApp Line Xing Threads

6.7L ENGINE – NO CRANK/NO START AND/OR BATTERY DRAIN – EQUIPPED WITH DUAL FUEL TANKS – BUILT ON OR BEFORE 5/5/2014

FORD

2015 F-450, F-550

2015 F- Super Duty 450/550 vehicles equipped with a 6.7L diesel engine, dual fuel tanks and built on or before 5/5/2014 may exhibit a discharged battery and a no crank/no start condition when the rear dual fuel tank selector switch is left in the on position.

These conditions may be attributed to low impedance in the dual tank switch system.

SERVICE PROCEDURE

Disconnect the batteries.
1. Recharge batteries as required.
Remove the passenger right front cowl side trim panel.
Remove G302 terminal screw and position aside.
Disconnect connector C2280B from the body control module (BCM).
Identify the gray/yellow (GY/YE) wire from relay kit. Strip 33 mm (1.25”) of insulation from the end of the wire.
Identify the wire pin terminal from the wiring kit parts list and strip 33 mm (1.25”) of insulation from the end of the wire.
Connect the relay kit GY/YE wire and pin terminal together. (Figure 1)
1. For all connections use only the solder splicing method and protect the connections with heat shrink tubing. The heat shrink tubing supplied in the kit contains hot melt glue that creates a waterproof and airtight connection. Make sure the heat shrink tubing covers all exposed wires plus at least half inch at both ends. Refer to WD, Section 5-1.
2. In the relay circuits kit, the yellow/green (YE/GN) and gray/blue (GY/BU) wires are not used. Heat shrink the unused circuits supplied in the relay kit. (Figure 1)

Figure 1

Identify the YE wire from the relay kit. Strip 33 mm (1.25”) of insulation from the end of the wire.
Identify black (BK) ground eyelet pin terminal 105460. Strip 33 mm (1.25”) of insulation away from ground wiring terminal.
1. The BK ground eyelet pin terminal can be located in the wiring harness terminal repair kit, box 4, drawer 14, terminal number 105460.
Connect relay kit YE wire and ground pin terminal 105460 together. (Figure 1)
On connector C2280B, slide back black cover of the connector and insert the GY/YE spliced pin terminal, from Step 7, into empty cavity pin 5 of connector C2280B. Secure the pin in the connector and close the cover of connector C2280B. Refer to WD, 13-1. (Figure 2)

Figure 2

Reconnect C2280B to BCM.
Reassemble G302 with relay kit ground eyelet and tighten screw to 12 Nm (106 lb-in).
Secure the relay kit in a vertical position to the existing radio antenna wiring harness tab. (Figure 3)

Secure the relay kit in a vertical position

Figure 3

Reinstall the passenger right front cowl side trim panel.
Reconnect the batteries.

JawayTool 127 Pieces Assortment Heat Shrink Tube Wire Wrap Kit Electrical Connection Cable Sleeve Tubing Sets With Durable Storage Case – Assorted Diameters- 2:1 Shrink Ratio

Minimum Shrinkage Temp: +90C; Full Shrinkage Temp: +125C maximum
Operating Temperature:-55C to +125C (-67F to 257F)
Dielectric strength: 15kV/mm; Tensile strength: 10.4Mpa
Approvals: CE Approved, environmental friendly, no toxic heavy metal, no PBB's, PBBO's, PBBE's
Top pro quality tubing with long-lasting features; hardly wear out

Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API

Vktech 150pcs 2:1 Heat Shrink Tubing Tube Sleeving Wire Cable 8 Sizes 2-13mm Black

Big collection of heat shrink tubing, 8 Specifications
Fully shrunk internal diameter: 1.0mm, 1.25mm, 1.75mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.5mm maximum
Shrinkage Ratio: 2:1 (will maximum shrink to 1/2 its supplied diameter)
Manufacture specification: ISO9001
Cutting method: Scissors or sharp knife