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More mystery wires in engine bay by firewall
#1
I feel like a broken record, but here I go again...

More mystery wires under the hood by the firewall. Hopefully easy to ID for someone...I hope...

#1 from main harness near brake master - weird clip/plug.
[Image: 2abdd7a7-29f8-42df-a027-750983a8173b.jpg]

#2 larger cut wire.
[Image: 44706c2f-4460-41f1-b8bb-4bf845400fd6.jpg]

#3 back of intake manifold
[Image: 6099FAA0-C756-4938-BDAD-E7A4070AA1C5.jpg]

#4 thru center / top of firewall
[Image: FD59321A-D770-4392-987D-D622E54205A2.jpg]

1973 Mach 1 Q-code C6 3:50
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#2
#1: brake master cylinder/proportioning valve plug
#2: Unknown. Note yellow wire added to main loom!
#3: seat belt relay on left; NSS/backup in middle, and engine gauge feed harness on right top. What's underneath the engine gauge feed harness is very strange, never seen that before.
#4. Unknown.

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

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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#3
midlife;262250 Wrote:#1: brake master cylinder/proportioning valve plug
#2: Unknown. Note yellow wire added to main loom!
#3: seat belt relay on left; NSS/backup in middle, and engine gauge feed harness on right top. What's underneath the engine gauge feed harness is very strange, never seen that before.
#4. Unknown.
Midlife
you are one of the greatest contributors to the site!!

- Jim
[+] 1 user Likes sdstang's post
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#4
midlife;262250 Wrote:What's underneath the engine gauge feed harness is very strange, never seen that before.

Do you mean the vacuum tee/lines above the oil pressure sending unit maybe?

1973 Mach 1 Q-code C6 3:50
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#5
#4 has same marking for the underhood mercury sw lite wire, but the plug end is different.
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#6
ScooterDog;262270 Wrote:
midlife;262250 Wrote:What's underneath the engine gauge feed harness is very strange, never seen that before.

Do you mean the vacuum tee/lines above the oil pressure sending unit maybe?

No. There are some other wires, notably a white/black and a yellow wire into a four pin flat plug?

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

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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#7
midlife;262294 Wrote:
ScooterDog;262270 Wrote:
midlife;262250 Wrote:What's underneath the engine gauge feed harness is very strange, never seen that before.

Do you mean the vacuum tee/lines above the oil pressure sending unit maybe?

No. There are some other wires, notably a white/black and a yellow wire into a four pin flat plug?

Oh! That's the repro guage harness.
[Image: 05A61F56-32F5-4A20-816D-24516ADB2538.jpg]

1973 Mach 1 Q-code C6 3:50
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#8
#2 was the aux power wire
Used on cars with high draw power options
convertibles
power window cars
auto seat release system
I think the light group too - under hood, trunk, map, glove box and under dash lights

I think #4 was a wire to the red under dash emission box on 73 cars
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#9
OMS;262466 Wrote:#2 was the aux power wire
Used on cars with high draw power options
convertibles
power window cars
auto seat release system
I think the light group too - under hood, trunk, map, glove box and under dash lights

I think #4 was a wire to the red under dash emission box on 73 cars

+1
#2 I think also rear window defrost power supply
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#10
Thanks for this info on the #2 pic. Mine hasn't been cut, but I can't find where it goes or where the loom anchors are supposed to connect. It's a good 5.5 feet long and has some kind of resistor or something on the end.
[Image: 20190615-164314.jpg]

[Image: 20190615-164218.jpg]

[Image: 20190615-164255.jpg]
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