Navigating the 68 Fairlane Electrical Parts Catalog Without Losing Your Mind
The 68 Fairlane Electrical Parts Catalog isn't something you flip through casually. It's a dense, multi-page guide that separates the working harnesses from the decorative trim lighting, and if you pull the wrong number off it, you'll end up with a part that physically fits but electrically does nothing for you. I've ordered fender-mounted turn signal bulbs that turned out to be reverse lights because the diagram cross-referenced by body style rather than by function. That happened to me on a Tuesday morning at a parts counter in Kansas. The catalog breaks down into sections based on the vehicle's assembly code and trim package. A 68 Fairlane 500 has a different lighting circuit than a base Sport Coupe, and the Falcon-derived components aren't interchangeable even though Ford shared a lot of wiring architecture with the Maverick later on. The numbers in the catalog correspond to Ford's internal part numbering system, which changed meaning depending on whether the part was stamped with a prefix like "D5TZ" or "E7TZ." Those prefixes matter more than most people realize. Here's the workflow I use when I need something. First, pull the vehicle identification number from the dashboard panel. Not the plate on the door jamb — the stamped VIN on the dash. Then look up the build sheet data online through the Ford Owner Community or a trusted Ford archival source. This tells you the plant code, the option codes, and the assembly date. With that information in hand, you go to the catalog section matching your body type and cross-reference the option codes against the electrical schematics printed in the back pages. The schematics show which circuits share ground points and which fuses protect them. Without knowing that, you'll chase ghosts through the fuse box for hours.
I spent three days once trying to figure out why the courtesy dome light wouldn't stay on after closing the door on my '68. The catalog showed me the correct switch part number, but the actual switch I got from a supply house had a different contact arrangement than what the wiring diagram depicted. The connector had four pins instead of three, and the extra pin was for a chime circuit that my particular trim level didn't use. I had to buy a used switch from a donor car that had the same interior code to get the right configuration. The catalog doesn't always flag these variant differences because they were considered minor production changes at the time. One thing the catalog undersells is the grounding scheme. All 1968 Fairlanes used chassis ground as the primary return path, and the ground points are located at specific locations along the frame rail and firewall. When you're troubleshooting and the catalog says a component grounds through the body, it means exactly that — no separate ground wire. I've seen too many people run an aftermarket ground wire to a component and then wonder why they still have a voltage drop issue. The problem was upstream at a corroded ground strap between the engine and the firewall. Clean the contact surfaces, torquing the bolt to the factory spec, and that usually resolves it within ten minutes. The catalog also lists interchangeability notes, but they're incomplete. Parts marked with an asterisk often carry over from the 1967 model year or carry forward into 1969, but Ford didn't always update those columns accurately. I found that several relay sockets listed for the '68 were actually reused from the '66 Fairlane with modified terminal positions. If you're rebuilding a harness and need exact replicas, buying NOS (new old stock) from a reputable breaker yard beats guessing off the catalog every time. The catalog is a starting point, not a final authority.
Another area where beginners struggle is the color code legend. Ford used a standardized wire color coding system in 1968, but the catalog doesn't always print the full code next to each circuit. You'll see notations like "Lg Blu/Red stripe" which means light blue wire with a red tracer stripe. These tracers indicate switched power feeds, and mixing them up with solid-color ground wires is how people blow instrument cluster circuits. Take a photo of the color code key in the front of the catalog and keep it next to your workbench. It saved me from rewiring a headlight switch assembly twice. If you're looking for a physical copy or a digital reproduction, there are several sources. Motor Publishing reprinted the original Ford shop manuals and parts catalogs in the 1990s, and those copies are still circulating. eBay tends to have scanned PDFs from various sellers, though the quality varies enormously. Some scans are illegible because the originals were photocopied too many times. The best versions I've seen come from the Ford Archives digital library, but access requires a subscription. For most people, buying a reprinted manual from a Ford specialist publisher like Classic Industries or FordParts.com is the most reliable route. The main limitation of any 68 Fairlane Electrical Parts Catalog reproduction is that it reflects the factory configuration only. Anything modified from the original — aftermarket stereo installations, added fog lights, restored headlight buckets with modern wiring — won't show up in the documentation. You need to trace those circuits yourself using a multimeter and a willingness to peel back door jambs and dash panels. The catalog will tell you what the car was supposed to have, not what it actually has after forty-plus years of ownership changes.
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There's also the problem of superseded parts. Ford replaced many electrical components during the 1968 model year with updated versions that had different part numbers but the same function. The catalog sometimes lists both the original and the replacement number, but often it doesn't. If you call a parts counter and give them a catalog number only to be told it's been discontinued, ask for the supersession number. They should be able to look that up in their internal system even if the catalog you're holding doesn't show it. One practical tip that isn't in any catalog: label everything before you disconnect it. I use small pieces of masking tape and a fine-point marker to write the circuit description and the corresponding part number from the catalog onto each wire or connector before I pull it. This takes an extra five minutes per connection, but it prevents the kind of confusion where you're holding six identical-looking brown wires and you have no idea which one goes to the heater core or the radio illumination circuit. Five minutes now saves two hours later.
