Marsram Ignition Coil Pack FD508 for Ford F150/Expedition 5.4L V8 - Straight Black Boot, Direct Replacement

Marsram FD508 ignition coil pack is a direct-replacement coil built to restore proper spark delivery on compatible 5.4L and select 4.6L V8 Ford, Lincoln and Mercury vehicles from the mid‑2000s.

This Marsram coil pack is designed to match the OEM footprint and electrical connections for specific Ford 5.4L V8 engines and some 4.6L V8 applications. It replaces commonly used OEM and aftermarket part numbers and comes with a one‑year warranty. Before purchasing, verify the coil’s straight black boot design to ensure compatibility with your vehicle’s V8 ignition harness—this unit does not fit V10 engines or coils with brown or curved boots.

How do I confirm this coil pack fits my truck?

Check the physical appearance and part numbers of your existing coil before ordering. The Marsram FD508 is made for V8 engines with straight black boots; vehicles equipped with brown or curved boots or V10 engines require different coils.

• Compare plug‑boot shape: straight black boots only.
• Match replacement numbers: FD508, C1541, C1659, UF537, DG511, and others listed.
• Use vehicle year, make, model and engine size: e.g., 2005–2008 Ford F150 5.4L V8.

What models and years are compatible with this part?

The Marsram FD508 covers a range of mid‑2000s vehicles that used the Ford 5.4L V8 ignition layout and certain 4.6L V8 models. It replaces multiple OEM codes, so cross‑referencing helps ensure a correct match.

• Ford F150 2004–2008 (5.4L V8)
• Ford Expedition 2005–2008, Lincoln Navigator 2005–2008 (5.4L V8)
• Ford Mustang 2005–2008 and Super Duty F250/F350 2005–2008 (5.4L V8)
• Explorer 2006–2008 and Mercury Mountaineer 2006–2008 (4.6L V8 compatibility listed)

What does this coil replace and what warranty is offered?

Marsram lists multiple interchangeable part numbers for the FD508 to simplify ordering and ensure serviceability across different supplier codes. The part ships with a one‑year limited warranty to cover manufacturing defects under normal use.

• Cross references include FD508, C1541, C1659, UF537, DG511 and more.
• One‑year warranty against manufacturing defects.
• Tested to meet electrical and fitment expectations for direct replacement.

How should I inspect and install a replacement coil pack?

Installation follows basic coil replacement steps: remove battery negative, unplug the coil electrical connector, unbolt the coil, and swap in the Marsram unit. Ensure the new coil’s boot orientation and connector match the original before tightening and reconnecting.

• Disconnect battery negative terminal first for safety.
• Verify straight black boot and connector pin alignment before installation.
• Torque mounting bolts to manufacturer specs and reconnect harness securely.

Who is this for? Technicians and DIY owners who need a reliable, direct‑fit ignition coil for mid‑2000s Ford, Lincoln or Mercury V8 engines will find the Marsram FD508 an appropriate replacement when the original coil shows misfire symptoms or electrical failure. It’s intended for vehicles that match the listed applications and for buyers who confirm boot color and shape to avoid ordering the incorrect coil for V10 or non‑compatible setups.