Topic: 1969 and 1970 Horns with and without oil cooler

[Anghelrestorations]

What should have been a short two page article turned out a bit longer when you add all the information.  Anyone has questions or comments let me know...should be an easy read since its mostly pictures.

http://www.anghelrestorations.com/uploads/3/1/7/6/3176630/69_70_horns_v1.0.pdf

[Cobrajet428]

Very nice work!

[mtinkham]

Excellent article.....thank you.

[Brian Conway]

Thank you Marcus.  Some interesting stuff.  Possible spelling error at the Horn Re-in Bracket section: inference ?  Brian

[Anghelrestorations]

Yep...spelling mistake.  I see that now...will fix it over the next few days with any other feedback. 

[Armond]

Nicely done Marcus!

[specialed]

Marcus are you sure the 70 ground wire end eyelet was for the horns & not used in 69 because wiring harness routes over to solenoid & voltage regulator & grounds there.  I was told once that the reason why the horns were mounted the waythey are hi-lo- was the way the currant draws voltage & the first horn gets more juice than the second horn & could be why they go bad first or fail or something like that.

[Anghelrestorations]

Well, I don't know how to prove, or disprove if that's why a ground wire was added to the horn area because of that.  I don't think even a wiring diagram would help with that.  The main thing I wanted to point out is that in 1970 we see cars that have that extra ground wire in that area and 1969 its not there.  Assembly manual shows this as well.  Im guessing why it was added there and can change the wording to be more clear about that unless we have a way to figure that out better.   

[midlife]

Marcus are you sure the 70 ground wire end eyelet was for the horns & not used in 69 because wiring harness routes over to solenoid & voltage regulator & grounds there.  I was told once that the reason why the horns were mounted the waythey are hi-lo- was the way the currant draws voltage & the first horn gets more juice than the second horn & could be why they go bad first or fail or something like that.

I agree with Ed here.  The ground wire lug was simply moved in 1970 and physically routed near and along with the RH horn line.  That ground lug is not horn specific: it is the general grounding point for the entire headlight harness.

A similar grounding point was used for all earlier models using foglamps.  The 70 Mach 1 sportlamps have their separate grounding scheme as well.

[J_Speegle]

Believe the direction of the horn mounting hardware differed between plants

San Jose normally have the nut on the back/engine side  (have 100's of examples) - Just one of those differences

Nice job on the article

[Anghelrestorations]

Yes agreed Jeff.  I just wanted to point out the assembly manuals between 1969 and 1970 show the mounting hardware orientation being different.  I just want to make sure I stay away from saying there is a right and wrong way to mount them since there is too many variables from plant to plant or shift to shift like you said.

[J_Speegle]

Know its a small detail but on 69 Boss 302s the horns are located both on the passenger side even without the oil cooler option

[Anghelrestorations]

Yep...I just didn't know how to exactly word that without calling it the "Drag Pack Option" and creating a whole new topic of discussion.  Maybe I can find a way to mention it differently in the article.  Open to suggestions on how to word that...

[J_Speegle]

Maybe something like


On certain Mustang, Cougar, and Shelby models with a 428, or during 1970 the Boss 302, that were equipped with the oil cooler and 69 Boss 302's and all Boss 429's, the horns would be moved to the passenger side to make room for the oil cooler. The radiator support would be modified on the assembly line to allow the horn to be relocated on these cars.

Just an attempt

[Anghelrestorations]

Ok...I will play around with the words and see what I can figure out along those lines.