Need opinions/suggestions on 5.0 swap wiring - Vintage Mustang Forums
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post #1 of 40 (permalink) Old 09-02-2019, 03:11 AM Thread Starter
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Need opinions/suggestions on 5.0 swap wiring

I’m close to sealing the deal on a 65 fastback with a 5.0l conversion but the engine bay has me a bit turned off. The car runs and drives great, with enough power for weekend cruising, but I’m wondering what I could possibly do with the wiring job.

The current owner performed the engine swap and purchased an aftermarket wiring harness (I believe he said Ron Francis??) but I’m a very detailed person and the engine bay doesn’t cut it for me. As for the wires, fuse box, and relays mounted to the passenger side engine panel, can these be relocated to somewhere in the interior and still function as intended? Where have others that have done this conversion mounted and routed their wiring/fuses/relays? What are my options with this setup to clean it up and make it more presentable?
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1966 Mustang Coupe
C-Code // 289ci 2v // C4 // Stock
Built in San Jose, Ca - True "Black Plate" car
<img src=http://i169.photobucket.com/albums/u223/finda1yola/1966%20Mustang/dfde62e0863454ede6c990a28bad470b_zpse45767f4.jpg border=0 alt= />
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post #2 of 40 (permalink) Old 09-02-2019, 08:28 AM
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Ron Francis is a well known wiring supplier. You could relocate the fuses and relays ect .sure,all it takes is more rewiring. Personally I'm not a fan of the Fox body look under a vintage hood. And the front timing cover dress and belt driven accessories


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post #3 of 40 (permalink) Old 09-02-2019, 08:51 AM
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I routed a lot of my wiring behind the engine on the firewall or under the dash. There are some wires that have to be in the engine bay, but all of the relays can be relocated under the dash. A lot of other wires can be routed more discretely as well.
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post #4 of 40 (permalink) Old 09-02-2019, 10:26 AM
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That engine compartment sure looks busy on the Op's car! Looks more like retrofitted oem fox wiring?
Take a look at this site in the link, lot's of good ideas and links to wiring solutions and others. You might want to check out his heater hose solution too for a clean look. Same with the export brace.
http://www.midnightdsigns.com/Mustang/Engine.htm

Last edited by Matter; 09-02-2019 at 10:29 AM.
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post #5 of 40 (permalink) Old 09-02-2019, 11:19 AM Thread Starter
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Quote:
Originally Posted by Miguelito2.0 View Post
I routed a lot of my wiring behind the engine on the firewall or under the dash. There are some wires that have to be in the engine bay, but all of the relays can be relocated under the dash. A lot of other wires can be routed more discretely as well.
Nice looking engine bay! Do you have pictures of how/where you routed the wires and where you mounted the fuses, relays, etc? Thank you!

1966 Mustang Coupe
C-Code // 289ci 2v // C4 // Stock
Built in San Jose, Ca - True "Black Plate" car
<img src=http://i169.photobucket.com/albums/u223/finda1yola/1966%20Mustang/dfde62e0863454ede6c990a28bad470b_zpse45767f4.jpg border=0 alt= />
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post #6 of 40 (permalink) Old 09-02-2019, 08:59 PM
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I don't have any pictures but essentially mounted the computer and relays under the dash near the center. I used James W's mustang site for a lot of the swap. I retained my stock fuse block and ran inline fuses when needed.
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post #7 of 40 (permalink) Old 09-02-2019, 09:22 PM
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It's a tight engine box for all the 5.0 EFI business. The biggest issue is the huge harness from the intake to the ECM, and I hate all the stuff they tied to the starter solenoid! Mine is a driver and utilitarian underhood. The neat and tidy route will require alot of wiring and sacrificing room elsewhere. I like the use of the crossflow radiator, my donor didn't have one. Good luck!


It's just a little rust...

1966 secretary special originally 6cyl 3 spd coupe.(Goes to work twice a week)
5.0 SEFI complete from 1988 Mustang GT, world class T-5, 9 inch with 3.50 Trac Lok and Shelby style traction bars. Old Air A/C system.
Build thread:https://forums.vintage-mustang.com/b...5-0-resto.html

1969 Mach 1: 1000 miles (almost) to get it....in progress(slow)
https://forums.vintage-mustang.com/b...long-term.html
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post #8 of 40 (permalink) Old 09-02-2019, 11:49 PM Thread Starter
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Originally Posted by 665spd View Post
It's a tight engine box for all the 5.0 EFI business. The biggest issue is the huge harness from the intake to the ECM, and I hate all the stuff they tied to the starter solenoid! Mine is a driver and utilitarian underhood. The neat and tidy route will require alot of wiring and sacrificing room elsewhere. I like the use of the crossflow radiator, my donor didn't have one. Good luck!
Got pics of your engine bay? Whether it’s good or bad I just want to get ideas of how others have their conversions setup. Thanks!

1966 Mustang Coupe
C-Code // 289ci 2v // C4 // Stock
Built in San Jose, Ca - True "Black Plate" car
<img src=http://i169.photobucket.com/albums/u223/finda1yola/1966%20Mustang/dfde62e0863454ede6c990a28bad470b_zpse45767f4.jpg border=0 alt= />
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post #9 of 40 (permalink) Old 09-03-2019, 10:48 AM
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Here’s mine. I would call it working functional. Easy to get to everything Without looking a a rats nest of wires and relays
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post #10 of 40 (permalink) Old 09-03-2019, 11:43 AM Thread Starter
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Here’s mine. I would call it working functional. Easy to get to everything Without looking a a rats nest of wires and relays
Well done - looks good to me! Where did you mount your fuses, relays, etc?

1966 Mustang Coupe
C-Code // 289ci 2v // C4 // Stock
Built in San Jose, Ca - True "Black Plate" car
<img src=http://i169.photobucket.com/albums/u223/finda1yola/1966%20Mustang/dfde62e0863454ede6c990a28bad470b_zpse45767f4.jpg border=0 alt= />
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post #11 of 40 (permalink) Old 09-03-2019, 11:38 PM
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All are on the right side apron. The cold air intake is in the way if you need to get to the headlight relays which are in the old battery area. The relays for the efi harness are on the rear apron. I’ve never had an issue but the car doesn’t see rain or snow.
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post #12 of 40 (permalink) Old 09-04-2019, 12:32 AM Thread Starter
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Originally Posted by dkmassner View Post
All are on the right side apron. The cold air intake is in the way if you need to get to the headlight relays which are in the old battery area. The relays for the efi harness are on the rear apron. I’ve never had an issue but the car doesn’t see rain or snow.
Thanks for the info! Assuming you completed the conversion using an aftermarket harness and wiring kit, were the supplied wires too short to route into the interior of the car or did you decide to keep everything in the engine bay due to convenience of installation? Just curious so I know exactly what to expect should I decide to purchase the car and reword everything to reach the interior.

If anyone else has more pictures to share please post!

1966 Mustang Coupe
C-Code // 289ci 2v // C4 // Stock
Built in San Jose, Ca - True "Black Plate" car
<img src=http://i169.photobucket.com/albums/u223/finda1yola/1966%20Mustang/dfde62e0863454ede6c990a28bad470b_zpse45767f4.jpg border=0 alt= />
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post #13 of 40 (permalink) Old 09-04-2019, 08:04 AM
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As I recall, the harness was set up for the efi relays on the apron. The only thing I have wired inside is the computer. I think you would have to rework the harness to get more components inside the car.
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post #14 of 40 (permalink) Old 09-04-2019, 09:15 AM
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All it takes is some wire, connectors, shrink tube, solder and patience. You can buy screw-together bulkhead plugs to run the harness through the firewall or apron to the kick panel, glove box area, etc.

If you want to construct your own harness, measure the wire runs with scrap wire or string and lay everything out on a sheet of plywood with screws or hooks to route the wires, then wrap it and install.

Bart

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post #15 of 40 (permalink) Old 09-05-2019, 08:48 PM
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Quote:
Originally Posted by Sydewaysix View Post
Got pics of your engine bay? Whether it’s good or bad I just want to get ideas of how others have their conversions setup. Thanks!
Mine is definitely a driver. I wanted as close as possible to the fox setup for simplicity of repairs and surprise factor. No attempt was made to hide the "busy" starter solenoid, just like the fox underhood. ECM is under carpet on trans hump. The strut tower brace had to be clearanced for the intake elbow and keyholed for the EGR vacuum hose. Pic is before alternator update and A/C install, although it looks very similar currently.
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It's just a little rust...

1966 secretary special originally 6cyl 3 spd coupe.(Goes to work twice a week)
5.0 SEFI complete from 1988 Mustang GT, world class T-5, 9 inch with 3.50 Trac Lok and Shelby style traction bars. Old Air A/C system.
Build thread:https://forums.vintage-mustang.com/b...5-0-resto.html

1969 Mach 1: 1000 miles (almost) to get it....in progress(slow)
https://forums.vintage-mustang.com/b...long-term.html

Last edited by 665spd; 09-05-2019 at 08:50 PM.
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