Core support wiring routing?

[HAZZARD66]

Does anyone have pictures or description of the harness routing on the core support.
I’m assuming it goes under the radiator in the cavity of the lower brace.
My 66 had a smashed and rotted core support and no wiring so it’s hard to tell. I’m using a universal harness so I guess it’s not super important to get it right, but would like to keep it out of the way of anything later on.

Thanks
Matt

 

[Teal68]

13 or 14 early Broncos and I have never had one that had wires routed across the core.

 

[DirtDonk]

Correct. Other cars and trucks do that, but Broncos did not.
The two headlights and turn signals each are fed from their own branch of the harness feeding out of the firewall either on each side or middle (depending upon the year) of the engine compartment.
No wires cross over.

If you do some custom wiring however the lower channel is the perfect spot except you will likely have to drill some access holes for wires to enter and exit.

 

[HAZZARD66]

Thanks, the Mustangs I have done always had the headlight wiring go across the core support so I just assumed the same in the Bronco.

Since it’s not stock anyway I may just try to run it in the lower part of the core support to cut down on the amount of wiring under the hood.

Thanks for the help, without anything to reference from the tare down makes it tougher.

 

[DirtDonk]

Definitely does. And Broncos are unlike many other vehicles in some aspects anyway, so add even more confusion.
The wires that I have ended up running through the channel were always headlight wires from relay setups.
Always worked out great and I like keeping extra wires out of sight.

 

[Steve83]

No wires cross over.

I think you might be mistaken, because I think this is from Ford.

(click this text)


I'm sure this is from the Ford parts manual:

(click this text)


And I remember seeing those YY-2 harness retainers on several eBs.

 

[toddz69]

I think you might be mistaken, because I think this is from Ford.

(click this text)


I'm sure this is from the Ford parts manual:

(click this text)


And I remember seeing those YY-2 harness retainers on several eBs.

That is correct - the 6 cylinder trucks had the wiring going across like that between the core support and the radiator. I don't know if it was like that on later year trucks or not but it was on the early ones.

Todd Z.

 

[toddz69]

Does anyone have pictures or description of the harness routing on the core support.
I’m assuming it goes under the radiator in the cavity of the lower brace.
My 66 had a smashed and rotted core support and no wiring so it’s hard to tell. I’m using a universal harness so I guess it’s not super important to get it right, but would like to keep it out of the way of anything later on.

Thanks
Matt

That's how I have my aftermarket headlight wiring routed. It's in a loom and I have it zip-tied at a few spots. Very clean. Unfortunately I don't have any pics. I probably take my radiator in and out more frequently than 98% of EB owners and I never have a problem with it.

Todd Z.

 

[jnirenstein]

My very original (at least I believe it to be!) 66 with a 6cyl did have the harness cross over the core. Here is a photo. In fact the new harness I bought from Dennis Carpenter is wired the same way with the split in the harness happening in the corner above the voltage regulator then heading across to the passenger side headlight. All the clips in my core support holding the harness appear to be original.

 

[Wes harden]

My left front core support with a some of the loom and head light connection 1969 302

 

[DirtDonk]

I think you might be mistaken…

It could happen!

I’m often forgetting to include six-cylinder Broncos in my can-o-worms memory bank.
Someday I may remember to take that into account, but apparently not today.

 

[904Bronco]

That's how I have my aftermarket headlight wiring routed. It's in a loom and I have it zip-tied at a few spots. Very clean. Unfortunately I don't have any pics. I probably take my radiator in and out more frequently than 98% of EB owners and I never have a problem with it.

Todd Z.

Kinda like this Todd?

 

[Steve83]

I’m often forgetting to include six-cylinder Broncos in my can-o-worms memory bank.

Frank's '75 had those retainers on the core support, and although it had a non-original V8, it did have V8 perches on the frame, so I think it was originally a V8 with wiring across the core support.

(click this text)

 

[DirtDonk]

What are the clips of which you all speak?
My 71 only has the hood rod retainer and no wiring. My friend’s 77 has the same. No wiring.

Interesting that the six cylinder voltage regulator is on the driver side too. Something I had either forgotten, or never noted when taking a peek under the hood of a six cylinder bronco.
Some important differences.

What about firewall and rear corner wiring? Do six cylinder Broncos have different wiring orientations at the firewall?

 

[jamesroney]

What are the clips of which you all speak?
My 71 only has the hood rod retainer and no wiring. My friend’s 77 has the same. No wiring.

Interesting that the six cylinder voltage regulator is on the driver side too. Something I had either forgotten, or never noted when taking a peek under the hood of a six cylinder bronco.
Some important differences.

What about firewall and rear corner wiring? Do six cylinder Broncos have different wiring orientations at the firewall?

Yup, my 1966 Budd roadster, the voltage regulator is on the driver's side core support. Headlights powered across the radiator.

 

[toddz69]

Kinda like this Todd?

Yours, as usual, is a lot cleaner than mine, Doug! My wiring is on the backside, underneath the radiator mounts (I think).

Todd Z.

 

[HAZZARD66]

Well I did a mock up of the routing and since its not stock by any means I routed it the cleanest and safest way I could find.

I have the harness coming out of the firewall at the left inner fender running at the top under the lip of the inner fender. When it gets to the core support it drops down to the openings for the headlights and parking lights then drops down again and runs inside of the lower brace of the core support behind the radiator. I drilled a 3/4 hole on the right side and used a grommet to protect the wiring as it exits the core support and goes up to the lights on the right.

I still have to do the protective sleeve on the harness but this is the mock up. I realize it was kind of tight making the turn at the steering box and fixed it after the pictures.

 

[Teal68]

This is the best forum site around...period! Never knew that about the I6 wire routing. I love learning new stuff and not being ridiculed. It really is the best site around for early Broncos. Best site of anything really!

 

[Steve83]

What are the clips of which you all speak?

They're labelled with a long PN, and then "YY-2" in parentheses on the 2nd diagram I posted. Wes' pic shows a few, and I think I can see a couple in J's pic above that. But Hazzard's show modern zip-ties, and 904's (Doug's?) shows modern steel clips with rubber liners screwed on.

 

[Oldtimer]

Scott Drake 376914-S Scott Drake Wiring Loom Ties

These wire loom ties are found through out the engine compartment. Black nylon.

www.holley.com