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licence plate light wiring

rmk57

Sr. Member
Joined
Feb 24, 2016
Messages
581
My 66 plate light doesn't work. I'd like to know where it enters/ exits the tailgate. Cant seem to find any holes anywhere, but the tailgate has had body work done at the bottom. Could be filled over?
 

Attac

Sr. Member
Joined
Jun 29, 2015
Messages
855
One of the 66 guys will chime in as I don't know if they are different but all of mine has a hole in bottom curvature of tailgate and there is another hole usually behind the tag in the angled part of tailgate where indent is. 2 wires with a grommet on upper hole and lower.
 
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rmk57

rmk57

Sr. Member
Joined
Feb 24, 2016
Messages
581
I have only one wire going inside the tailgate. I'm guessing the bulb housing is used as the ground though.

I'm suspecting the hole at the bottom has been filled over.
 

DirtDonk

Contributor
Bronco Guru
Joined
Nov 3, 2003
Messages
42,670
Very likely. And yes, the housing grounds to the gate, and there are three holes if I remember.
One all the way on the underside, one at the first step pointed upward, and the third at the upper section facing roughly downward towards the other.
Never understood why they couldn't have just made a pocket for the wire along the side to connect to the two cavities, but this is how they chose to do it back then.

Because of the design of the socket wiring, it also takes a slightly unusual bulb. Forget the number, but it's not one of the standard ones you see everywhere else. I think it's got two contacts, but the alignment pins are of the same size and no offset like on an 1157 bulb.

Good luck.

Paul
 

Attac

Sr. Member
Joined
Jun 29, 2015
Messages
855
here is a quick visual reference for ya.
Red circles are where all the holes should be. top hole is behind tag bracket
 

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rmk57

rmk57

Sr. Member
Joined
Feb 24, 2016
Messages
581
Yes mine has the holes just as you described, minus the one exiting to the harness. My bulb is a single contact, I think a G3.

Thanks, Randy
 

DirtDonk

Contributor
Bronco Guru
Joined
Nov 3, 2003
Messages
42,670
Ok, I certainly could be wrong on the bulb. Whatever fits and works is the right one!;D
 

thegreatjustino

Contributor
Red Head Grease Monkey
Joined
Jan 23, 2002
Messages
14,907
Loc.
Stockton, CA
Yes mine has the holes just as you described, minus the one exiting to the harness. My bulb is a single contact, I think a G3.

Thanks, Randy

Single contact bulb isn't correct for an OEM socket.

1178 is the OEM bulb
 

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ryan97

Full Member
Joined
Nov 22, 2007
Messages
195
Loc.
Richmond
Yes single + wire thru the underside curve of the tailgate below the license plate. Grounds thru the fixture
 

Mikej2244

New Member
Joined
Oct 7, 2015
Messages
33
Anyone have any good advice on grounding the tailgate itself. As noted, the license plate lamp grounds to the gate, but on my truck the gate is apparently not grounded well because my light does not work unless I jump the ground wire to the frame or body.
 
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