Experiencing issues with your 1996 Ford F250’s cigarette lighter or OBD2 port? A blown fuse is often the culprit. This guide will help you locate the relevant fuse and troubleshoot the problem effectively.
Locating the OBD2 Fuse in Your 1996 F250
For 1996 Ford F250 models, the fuse that protects both the cigarette lighter and the Diagnostic Link Connector (OBD2 port) is crucial for diagnosing vehicle issues and powering accessories. If you’re facing a non-functional OBD2 port or cigarette lighter, checking the fuses should be your first step.
The primary fuse to inspect is Fuse 16 in the Interior Panel (IP) Fuse Box. This fuse is directly related to the circuits powering these components. The Interior Panel Fuse Box is typically located beneath the dashboard inside the vehicle.
An interior fuse box diagram for a 1996 Ford F250, highlighting the location of fuses relevant to the OBD2 port and cigarette lighter.
However, Fuse 16 is not the only fuse in the circuit. It’s powered by a larger Maxi-Fuse 20 (50 amp) located in the Power Distribution Box. This Power Distribution Box is situated under the hood, on the driver’s side fender well, near the air cleaner housing. Maxi-Fuse 20 is critical as it supplies power to multiple fuses, including Fuses 4, 8, and importantly, Fuse 16 in the interior panel.
A detailed fuse diagram of the power distribution box in a 1996 Ford F250, showing the position of Maxi-Fuse 20 and its connection to interior fuses.
Troubleshooting a Blown Fuse
Here’s a step-by-step approach to diagnose and address a blown fuse issue:
- Visual Inspection: Begin by visually inspecting Fuse 16 in the interior fuse panel and Maxi-Fuse 20 in the power distribution box. Look for a broken wire inside the fuse or any signs of burning. If a fuse looks visibly damaged, it needs replacement.
- Voltage Check: If the visual check is inconclusive, use a multimeter to check for 12V at the cigarette lighter socket. If there’s no voltage, it indicates a problem upstream, likely with the fuse.
- Maxi-Fuse 20 Check: If Fuse 16 is intact but there’s no power, check Maxi-Fuse 20. A blown Maxi-Fuse 20 will cut power to Fuse 16 and other essential circuits.
- Identify the Cause: A frequently blown fuse suggests a short circuit. In this case, the original poster mentioned a cigarette lighter wiring short at the ashtray support. Investigate for any exposed or damaged wiring in the cigarette lighter and OBD2 port areas to prevent recurring issues.
Understanding the Fuse Layout
The fuse diagrams provided are essential for correctly identifying fuse locations and their respective circuits. Note that Ford transitioned from letter designations to number designations for fuses in 1996, making these diagrams specific to your 1996 F250 model year.
By systematically checking Fuse 16 and Maxi-Fuse 20, and addressing any underlying short circuits, you can effectively resolve power issues with your 1996 Ford F250’s OBD2 port and cigarette lighter. Remember to always replace a blown fuse with one of the same amperage to protect your vehicle’s electrical system.
Fuse and Circuit Information:
| Fuse Position (Power Distribution Box) | Amps | Circuits Protected |
|---|---|---|
| 20 | 50 | See Fuses 4, 8 and 16 (IP Fuse Panel). Also See Circuit Breaker 12 |
| Fuse Position (Interior Panel Fuse Box) | Amps | Circuits Protected |
|---|---|---|
| 16 | 20 | Fuel Pump Relay |
