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Discussion Starter #1
I am getting close to purchase the kit (FFR), why would I want to use a factory harness with all the extras, when I can purchase the FMS EFI kit and add a painless or francis fuse block wiring kit. It seems to me that the NEW kits would be cleaner(easier) to install. Are there any nightmares in going with either kit.
Thanks
 

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FFCobra Master Craftsman
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3,285 Posts
TC, I am an admitted electrical idiot. I got a Painless harness carb-kit FFR, and am building it with an EFI engine. The interface between the Painless harness and the Ford EFI engine control harnesses is not too difficult IF you know what you're doing, or know someone who can guide you through it. I'm lucky enough to have Doug Huey nearby, who has recently done an identical wiring job on his FFR.

I've spent probably two weeks of work time on wiring, trying to figure stuff out and trouble shooting my screwups. I don't enjoy this kind of problems, and have little in the way of skills to remedy them. That said, the Painless harness is a sanitary looking installed piece, and there are no Mustang switches in sight.

My first build used an entire donor harness, I stripped out nothing. I used Mustang switches and everything plugged in just fine. I needed almost no electrical knowledge to install it, it worked perfect first time, and continued to be 100% reliable for 4 years and 62,000+ miles. I had some strange looking bundles of un-used connectors and wires tied to out-of-sight parts of the frame, but nobody ever looked under there anyway.

If I used a donor harness for the present build, I'd have it stripped-down by one of the specialists, and all terminals and connectors labelled. Well worth the cost I think. I've only recently learned of Ron Francis Wire Works, and think their system is worth a look. Problem is, you'll still have to have an engine/computer harness. I spent about $500 for new FRPP engine/computer harnesses and sensors I needed on the Phoenix. Francis and Painless sell similar setups I think, that interface with their main electric harness. If you have a donor, you should be able to use engine wiring and sensors you already have, but you'll have to know how to connect the harnesses and computer to the frame wiring harness you're using.

Bottom line: I kind of wish I'd used a donor harness and Mustang switches, just because they work so well, so simply, and I'd be done with electricity by now! Someone with more electrical knowledge would probably feel differently. Sorry this got long!
 

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Senior Charter Member
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474 Posts
The factory harness saves you money. That's why you may want to use it. I used the Painless 18 circuit with the Ford Motorsports harnessess (engine and computer). They are the same as the '93 Mustang harness. You still have "extas" since it's a production harness. All the quick connects that go to other harnessess will not have the other end (pigtail). So you will have to solder the connections. I didn't have any real issues. It took a while. The 18 circuit fuse box is bigger than the 12 circuit so it was harder to mount. Everything works great now and I have all new sensors - some came with the harness kits, others didn't.
 

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Rip Snortin Post Maniac
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You can use the donor engine and computer harness with the Painless harness for the rest of the car. The FMS kit is the same harness. Buy, beg, borrow or steal the FMS wiring harness installation instruction book and the Helms diagrams from your year donor. There are 2 connectors that get cut off (brown and green). These are all the wires to connect to the Painless harness, gauges and ignition switch. The FMS book walks you right through it. You may need to make up some wire for the 02 sensors. No biggie. the sensors can be found at Autozone, discount or even a junkyard.
 
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