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Need help with wiring grill lights
#1
Well after several long hours of wrenching, we finally got the new mach 1 grill installed.  It came out very nice.


[Image: zach_grill_1.jpg]

I got the 72 style grill mounting bracket from Don at OMS.  Its nice to have someone that seems to be able to find just about any original part you need.
It was not as easy as it looks to mount this new grill.  We had to unbolt the back bumper bolts and loosen the front bolts so it would drop down to get the old grill out and the new one in.  Then to get the mounting bolt holes to line up around the head light, we had to pull HARD in multiple directions to flex the tabs to where they lined up properly with the holes.  Only 3 out of the 4 holes actually lined up, but that should be plenty.  The center bracket was a snap.  I just didnt like the tiny little screws that were originally used, so I drilled the hole out a tiny bit in the grill so it would fit a larger 1/4-20 bolt.  Then I replaced the U nut on the grill bracket to 1/4-20 and it screwed right on.  I did have to drill a new hole in the bottom of the core support to attach the bottom of the center bracket to the core support.  I just used a self tapping screw.  Worked out great.  Of course to drill the hole, we had to remove the lower stone guard body panel, which was completely rusted on, so we could get the drill at a decent enough angle to drill a pilot hole.  But it all worked out.  Miraculously, the hood latch lined up correctly on the first try.


[Image: grill_mounting.jpg]

gif hosting



My question is, what is the best way to wire up the grill lights.  The sockets that I got, which were recommended by several members here, have 3 wires.


[Image: Grill_Light.jpg]



Looking at the wiring diagram, it only shows 2 wires.  So I am somewhat at a loss right now on what to do.  Does anyone know exactly what each wire does?

Here is the overall Lighting circuit diagram.


[Image: headlight_wiring_diagram.jpg]

Here is a zoom in of the headlights and the grill lights.


[Image: headlight_wiring_diagram_zoom.jpg]

Tracing the Yellow Power wire(478) back to its origin reveals that it goes to this 3 prong connector.  The 3 prong connector is a mystery to me.  Another mystery is Wire #15, which is also pinned in to the same pin on the 3 prong connector, but it goes over to this rectangular box.  Does anyone know what the rectangular box represents?  What #15 is? 


[Image: headlight_wiring_for_switch.jpg]


I am wondering what the 3 wires on my new socket do compared to the 2 wires shown on the diagram.
Then I am also wondering if I can tie these grill lights into the headlight circuit.
If So should I run the Yellow wire to the Red headlight wire or the Green Headlight wire?  I want them to be on with both high and low beams.

Any help would be fantastic.

Thanks in advance guys!

Jim
how to upload photo on internet
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#2
(12-16-2017, 02:01 PM)jowens1126 Wrote: Well after several long hours of wrenching, we finally got the new mach 1 grill installed.  It came out very nice.




I got the 72 style grill mounting bracket from Don at OMS.  Its nice to have someone that seems to be able to find just about any original part you need.
It was not as easy as it looks to mount this new grill.  We had to unbolt the back bumper bolts and loosen the front bolts so it would drop down to get the old grill out and the new one in.  Then to get the mounting bolt holes to line up around the head light, we had to pull HARD in multiple directions to flex the tabs to where they lined up properly with the holes.  Only 3 out of the 4 holes actually lined up, but that should be plenty.  The center bracket was a snap.  I just didnt like the tiny little screws that were originally used, so I drilled the hole out a tiny bit in the grill so it would fit a larger 1/4-20 bolt.  Then I replaced the U nut on the grill bracket to 1/4-20 and it screwed right on.  I did have to drill a new hole in the bottom of the core support to attach the bottom of the center bracket to the core support.  I just used a self tapping screw.  Worked out great.  Of course to drill the hole, we had to remove the lower stone guard body panel, which was completely rusted on, so we could get the drill at a decent enough angle to drill a pilot hole.  But it all worked out.  Miraculously, the hood latch lined up correctly on the first try.




gif hosting



My question is, what is the best way to wire up the grill lights.  The sockets that I got, which were recommended by several members here, have 3 wires.


[Image: Grill_Light.jpg]



Looking at the wiring diagram, it only shows 2 wires.  So I am somewhat at a loss right now on what to do.  Does anyone know exactly what each wire does?

Here is the overall Lighting circuit diagram.




Here is a zoom in of the headlights and the grill lights.




Tracing the Yellow Power wire(478) back to its origin reveals that it goes to this 3 prong connector.  The 3 prong connector is a mystery to me.  Another mystery is Wire #15, which is also pinned in to the same pin on the 3 prong connector, but it goes over to this rectangular box.  Does anyone know what the rectangular box represents?  What #15 is? 





I am wondering what the 3 wires on my new socket do compared to the 2 wires shown on the diagram.
Then I am also wondering if I can tie these grill lights into the headlight circuit.
If So should I run the Yellow wire to the Red headlight wire or the Green Headlight wire?  I want them to be on with both high and low beams.

Any help would be fantastic.

Thanks in advance guys!

Jim
how to upload photo on internet
There is no reproduction 2 wire sportslamp socket, so the three wire one is used.  Simply ignore the black wire (ground) as it is not used; it goes to the metal prong on the side. 
To wire it correctly, you need to tap into the orange/red wire on the dimmer switch (inside the passenger compartment, wire 15).  This gives power whenever the headlights are on, regardless of low or high beams.  The other wire is black and is your ground.  

The yellow wire with three outgoing lines is an internal splice in the underdash harness.  You normally will not have access to it.
Hope this helps.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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#3
Midlife,

What is The square box on the diagram where 15 goes to?

I'm also a bit confused. There are red, brown and black. You said don't use the black, then you said black is ground.
  Reply
#4
The box-like structure is the headlight harness connector that goes to the back of the fuse box.

I'm sorry; my wire colors are from the headlight harness. Just use the two wires that go to the two interior pins of the lamp socket and ignore the outer pin (which is typically black).

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
  Reply
#5
ok thanks, that helps alot!

Another question on the headlights.

When the brights are on are both the red and green wire energized?  I know on some vehicles, the brights are when both elements are powered.  If that is the case, I could wire right in to the red wire right by the headlight and I wouldnt have to worry about running a wire to the interior.
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#6
I don't believe so with single beam headlights. I believe they use different filaments; I know that the dimmer switch switches from one to the other.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
  Reply
#7
(12-16-2017, 07:39 PM)jowens1126 Wrote: ok thanks, that helps alot!

Another question on the headlights.

When the brights are on are both the red and green wire energized?  I know on some vehicles, the brights are when both elements are powered.  If that is the case, I could wire right in to the red wire right by the headlight and I wouldnt have to worry about running a wire to the interior.

Headlight lights are switched.
How about tapping into the side marker lights
That way they are on with just the parking lights and when the headlights are on too.
I don't think the small power draw of two lights would bother the flashers
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#8
Thanks Don. I May try that.
  Reply
#9
I don't know if the 73 version or the Mach I grill lights are different, but my car has 3 wire connection and 3 wires going into the harness. I assumed that it had to have this in order for them to also work as turn signals?

The grill lights an side lamps come on with the headlight knob pulled out half way (I guess they are considered driving lights ?) and stay on with the knob out all the way.

Just curious as I have been following this thread and finally had to go look at my car to make sure I remembered correctly.

[Image: Front%20Grill%20Light%20Wires.jpg]

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
  Reply
#10
73 sportslamps are different: they contain turn signals and running lights separately, and need the ground line for the two filaments. 71/72 bulbs have only one filament.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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