My 79 PC has an older version of the Ron Francis WireWorks kit installed in it. My plan at this point in time is to install his 24/7 kit into my 82 GT unless I win the lottery or my new business takes off and affording this kit is more of an option
https://infinitybox.com/restoration-and-performance/ this is the most new car OEM wiring type system that I am aware of at this time. The kit is awesome, but at a minimum of $1500 for my needs its a bit expensive to say the least.
I am not a fan of Painless wiring, I generally find their kits to be anything BUT Painless. Others opinions may vary, but I personally don't like them. Virtually any wiring kit that you might install in our Four Eyes is going to be somewhat generic and require some additional work and parts most likely from your original wiring. The Ron Francis kit is very good, but will not include your light sockets for the tail lights, side markers, and turn signals. New headlight (sealed beam) type will be included. The pigtails for the instrument cluster if using the OEM unit are not included. None of the pigtails on the HVAC controller will be included, same for your PW, PL, etc. The kit does include a new headlight switch that will fit the Fox dash, includes all the steering column pigtails as long as you order the correct ones on the order form. Depending on your ignition setup under the hood, they do offer many options for the OEM Duraspark and TFI, as well as alternator pigtails and your basic sensors such as coolant temp, oil pressure, etc. Otherwise many if not most of your engine harness will need to be reused or new one fabricated. Again all of this depends on how stock or custom your ride is. Many of the needed pigtails for even the stock items are available from Ron Francis, LMR, Ford Motorcraft, and others.
If rewiring a bone stock car, IMHO the generic kits such as Ron Francis, Painless, etc are not your best option. If your ride is non stock/custom such as all of my Foxes, then they are a great option to replace old brittle OEM harnesses, run wiring out of sight, and just generally have a simpler, easier setup. Good Luck and hope that helps.
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