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Under Hood Light, Convenience Group
#1
Time to clean up under the hood. 
The Mach I bought has the convenience group.  This is my under hood light.

The schematic I have says the under hood light it is a mercury switch light.  This sure doesn't look like one.
Is this the correct fixture/bulb socket?  It's certainly original.

The wire on mine is just dangling.  The schematic shows a 7.5 amp fuse, then connection to the plus side of the solenoid where all the hots are.
It must be an inline fuse holder?

Can someone detail how this light and connection is supposed to be?

Thanks


Attached Files Thumbnail(s)
   
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#2
It should be a breaker, not a fuse. The switch built in the socket. What you show is the same as mine
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#3
Here's a pic of what mine looked like

[Image: IMG_3092.jpg]
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#4
The routing looks somewhat correct. If you want it to look more like Bill's 73 then the wire should be fastened to the hood by these:


https://www.macsautoparts.com/store/tail...15-70.html

If you want to replace/clean up the wire loom, you can use these parts from NPD:

https://www.npdlink.com/store/?p=catalog...t=1&year=0

https://www.npdlink.com/store/?p=catalog...t=1&year=0
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#5
Thanks, that's a big help so far.
I can't believe that little fixture is the mercury switch unit.  OK
I'll have to test mine.

Where does it plug in?  I lose the vision of the wiring in the picture when it drops down behind the air cleaner.
My wiring harness under the hood so far appears unmolested.
This assembly has an inline male plug on its end.
There should be a female plug in that region for it to plug into right?
Where is the "circuit breaker" located?
My 1972 schematic clearly shoes a 7.5 amp fuse between this light and 12V.
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#6
There should be an inline fuse towards the end of the wiring. Then, on mine, there was an eye connector that connected to the 12v, probably at the starter solenoid.
On the original light, they used a mercury switch but on the repro ones, it sounds like a more mechanical thing since you can hear it moving back and forth as you tip the bulb part.
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#7
(04-22-2018, 09:27 AM)SteveO_71 Wrote: The routing looks somewhat correct. If you want it to look more like Bill's 73 then the wire should be fastened to the hood by these:


https://www.macsautoparts.com/store/tail...15-70.html

If you want to replace/clean up the wire loom, you can use these parts from NPD:

https://www.npdlink.com/store/?p=catalog...t=1&year=0

https://www.npdlink.com/store/?p=catalog...t=1&year=0
Thanks for the links.
The one from NPD says its "exact" but it's for a 69-70.
I guess the aftermarket doesn't have an original style for 1972.
I still can't believe there's a mercury switch inside the little square original one...

I get no continuity thru mine no matter what angle I have it at.
I'll soak it overnight in evaporust and hope to get lucky
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#8
(04-22-2018, 10:29 AM)andy72 Wrote: Thanks, that's a big help so far.
I can't believe that little fixture is the mercury switch unit.  OK
I'll have to test mine.

Where does it plug in?  I lose the vision of the wiring in the picture when it drops down behind the air cleaner.
My wiring harness under the hood so far appears unmolested.
This assembly has an inline male plug on its end.
There should be a female plug in that region for it to plug into right?
Where is the "circuit breaker" located?
My 1972 schematic clearly shoes a 7.5 amp fuse between this light and 12V.

The convenience package option, if I recall correctly, included the hood and trunk light, glove box lock and light, automatic seat back release actuators, etc.

Where does it plug in?  You should have an accessory wire that runs over the passenger side shock tower to cowl brace. On that wire is a single female plug. This accessory wire is connected to the solenoid or terminal block on the battery side. It feeds other non-switched features such as convertible roof motor, automatic seat back release actuators, etc. and is fused.

The light socket is grounded thru the mounting bracket and has the typical spring loaded (positive) contact in the middle of the socket base. When you press the bulb in it depresses the contact completing the circuit. When you tilt the bulb up the light will be off and when titled down it will turn on. Just as it would when opening and closing the hood. I have ahd a few where the positive contact is corroded/rusted or the mercury has managed to escape at some point. Clean up the contacts as much as possible, insert a working bulb, and ground it and give it 12 volts and just start tilting it.


[Image: 20170517_174558_rx.jpg]
[Image: 20160531_080652.jpg]

[Image: 20160531_074711.jpg]

[Image: 20160531_080558.jpg]

1973 H Code Convertible - Medium Copper Metallic - June 8, 1973, Built Ford Marketing Sales Vehicle
[Image: DSC_0266xsm.jpg]
[Image: satellite.png] Proud Space Junk Award Winner!












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#9
I never put a lamp into the socket since it would stay lit all the time at an all day car show. Same with the trunk light (which is the same style light).
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#10
Here is the trunk light mercury switch version. It has a different mounting bracket and wire.

[Image: s_l1600.jpg]

1973 H Code Convertible - Medium Copper Metallic - June 8, 1973, Built Ford Marketing Sales Vehicle
[Image: DSC_0266xsm.jpg]
[Image: satellite.png] Proud Space Junk Award Winner!












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