Dome light question

Help Support 7173Mustangs.com:

vintageman

VIP Members
Joined
Dec 10, 2017
Messages
506
Reaction score
101
Location
Georgia
My Car
1973 Mach 1 "Q Code"
Alright this is probably a stupid question and I am probably overthinking everything but here goes. I installed a one piece TMI headliner a couple years ago and really like it, I am now getting around to the last few things like installing my dome light. I have run a new dome light power wire from the drivers side harness and it is coming down through the headliner to connect it to the light housing. Does it matter which mounting screw the power wire connects to? There are 2 "lugs" that connect to the bulb, so I figure either would work for the power connection but wanted to ask first. Also, if using the mounting screw to connect the power wire, won't this also ground out the power wire? The new dome light is a Scott Drake product if that makes a difference. Pic is below, not my pic, just one I found that looks like my new dome light. Thanks.

Tom
 

Attachments

  • Dome Light.jpeg
    Dome Light.jpeg
    188.9 KB · Views: 12

Don C

Fords Forever
Joined
Jan 1, 2012
Messages
8,107
Reaction score
861
Location
Springfield, OR
My Car
1971 Mustang Sportroof M code
You are correct. If both of those screws go into metal in the dome light bracket they will both be grounded.
Maybe the other two holes are for mounting.
 

vintageman

VIP Members
Joined
Dec 10, 2017
Messages
506
Reaction score
101
Location
Georgia
My Car
1973 Mach 1 "Q Code"
Thanks Don, the dome light assembly is plastic with only those 2 strips of metal. As I understand it, the threaded retainers in the actual roof are metal, so if using screws to mount the power wire to one of the metal strips on the dome light assembly, then I would be essentially connecting the power wire to the metal roof and cause an electrical short. That doesn't sound like a good thing, so how does the power wire connect to the dome light assembly correctly?
 

Richie

New member
Joined
Jan 4, 2022
Messages
4
Reaction score
6
I had the same problem with my 72, I though I had the wire hooked the right way. As time went on, the battery went dead, I charged the battery up, and later it went dead again. I put a new battery in this time thinking maybe I had a bad battery. not to long that battery went dead, So I took my car down to the Auto electric company in my home town, inform them my problem, left the car there and went home .The next morning they called me to come get my car.When I got there I ask them what was the problem. I was told the dome light was cross wired that I had the power wire grounded.
 

vintageman

VIP Members
Joined
Dec 10, 2017
Messages
506
Reaction score
101
Location
Georgia
My Car
1973 Mach 1 "Q Code"
Thanks for the response Richie. So did they shorten the power mounting screw so that it only made contact with the dome light metal strip and not get screwed into the actual roof or did they correct the issue another way? Thanks for your response.

Tom
 

Richie

New member
Joined
Jan 4, 2022
Messages
4
Reaction score
6
I can't answer that question They fix the problem, and I never mess with it sorry.
 

vintageman

VIP Members
Joined
Dec 10, 2017
Messages
506
Reaction score
101
Location
Georgia
My Car
1973 Mach 1 "Q Code"
Thanks for the quick response, I think that I will try a shorter screw for the power wire and see how that goes. More to follow.

Tom
 

Cjmach1

Member
Joined
Sep 10, 2019
Messages
14
Reaction score
0
Location
Canada
My Car
73 mustang Mach 1 Q code
As far as I can remember it’s one wire live and a screw grounds the base to the sheet metal
 
Top