HD Headlight Harness Plug Location?
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Junior User
Joined: Nov 2007
Posts: 89
Likes: 1
From: OR
HD Headlight Harness Plug Location?
I bought a heavy duty headlight harness with relays for my 97 F350 and need to know where the blue plug connects into the original harness.ffice
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If somebody has a picture, that would be great.<O></O>
There are a couple plugs of this type under the master brake cylinder that lead into the fuse block but if it’s one of these then I’ll need to rework the harness a bit to reach.<O></O>
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I also bought a pair of the Philips 9007 extreme lamps and I'm anxious to see if they stand up to the hype?<O></O>
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></O>If somebody has a picture, that would be great.<O
></O>There are a couple plugs of this type under the master brake cylinder that lead into the fuse block but if it’s one of these then I’ll need to rework the harness a bit to reach.<O
></O><O
></O>I also bought a pair of the Philips 9007 extreme lamps and I'm anxious to see if they stand up to the hype?<O
></O>
Junior User
Joined: Nov 2007
Posts: 80
Likes: 1
From: Jefferson, Georgia
Headlight Harness
I am going by memory here (it has been about 2 years since I did mine), but, the blue plug gets plugged into the drivers side factory headlight plug and the factory passengers side does not plug into anything (just dangles there - I wrapped it up and taped it to prevent debris from getting into it).
- Unplug the 2 factory lamp plugs from the headlamps
- Plug in the the black plugs (from new harness) to the headlamps bulbs
- Plug in the blue plug (from new harness) into the drivers side factory lamp plug
- Wire up the relay / ground
I immediately noticed a huge difference in my headlamp performance. I did the same for my '77 CJ-7 as well. Now your headlamp on/off only activates the relay and not the lamps themselves, thus allowing full current to go to the lamps.
I hope this helps you out and doesn't confuse you.
- Unplug the 2 factory lamp plugs from the headlamps
- Plug in the the black plugs (from new harness) to the headlamps bulbs
- Plug in the blue plug (from new harness) into the drivers side factory lamp plug
- Wire up the relay / ground
I immediately noticed a huge difference in my headlamp performance. I did the same for my '77 CJ-7 as well. Now your headlamp on/off only activates the relay and not the lamps themselves, thus allowing full current to go to the lamps.
I hope this helps you out and doesn't confuse you.
Thread Starter
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Junior User
Joined: Nov 2007
Posts: 89
Likes: 1
From: OR
hijo202,
Thanks for the answer, That makes total sense and will be much simpler than what I had in mind.
The instructions were written in Chinglish and I thought I was supposed to be tapping in somewhere up stream.
Yes it comes with two relays.
I'll probably flip the harness over and plug into the pasenger side.
That way I can tap my hot leads into the hot side of the glow plug relay.
The instructions say to bolt them to the battery terminal but I could see them being eaten up with acid in just a couple years.
Thanks for the answer, That makes total sense and will be much simpler than what I had in mind.
The instructions were written in Chinglish and I thought I was supposed to be tapping in somewhere up stream.
Yes it comes with two relays.
I'll probably flip the harness over and plug into the pasenger side.
That way I can tap my hot leads into the hot side of the glow plug relay.
The instructions say to bolt them to the battery terminal but I could see them being eaten up with acid in just a couple years.
Thread Starter
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Junior User
Joined: Nov 2007
Posts: 89
Likes: 1
From: OR
Thanks Joe,
I was looking at the starter relay and calling it the glow plug relay, my bad.
Anyway, that does look like the most sanitary install.
I was looking at the starter relay and calling it the glow plug relay, my bad.
Anyway, that does look like the most sanitary install.
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Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
ok this is the 2nd time i have seen this HD headlight harness. wuts the reason to be switching to the "HD" harness?? just wondering b/c for whatever reason when i turn on my headlights or parking lights my voltage guage drops way down to a point where if i'm running my radio then it will turn off b/c its not getting enough power. come to think of it i'm going to start a new thread on this right now.
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Junior User
Joined: Nov 2007
Posts: 80
Likes: 1
From: Jefferson, Georgia
Headlight Harness
Here is where I got mine from. I have know others to make their own by going to the junk yard and getting the factory plugs and constructing it just like this one..
Upgraded Headlight Harness for 94 to 04 Ford with 9007 Bulbs
I hope it helps you.
Upgraded Headlight Harness for 94 to 04 Ford with 9007 Bulbs
I hope it helps you.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
ok this is the 2nd time i have seen this HD headlight harness. wuts the reason to be switching to the "HD" harness?? just wondering b/c for whatever reason when i turn on my headlights or parking lights my voltage guage drops way down to a point where if i'm running my radio then it will turn off b/c its not getting enough power. come to think of it i'm going to start a new thread on this right now.
The point of this harness is the get full power to the head lights. Stock the head light wiring and relays are too small so you get 2 or 3 less volts to the head lights than your could/should. This harness gets all the voltage possible to the headlights and makes them brighter.
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Junior User
Joined: Nov 2007
Posts: 89
Likes: 1
From: OR
I swiped the harness photo from GOS Performance, so I should probably give them credit and a link.
http://www.gosperformance.com/inc/sdetail/1983
The GOS Performance harness appears to be a better quality unit but quite pricy at $69
<O
I bought my harness from LMC Truck for $29 part #47-3662
http://www.lmctruck.com/icatalog/fe/full.aspx?Page=67
<O
The LMC Truck harness is made in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com
</st1:country-region>Taiwan </ST1and came with confusing (to me) “Chinglish" instructions.
<O
Can’t say if it would work with HIDs? I have know idea how they are wired.
Most certainly if the power to the HID transformer takes the painfully long small gage circuitous route through the dash switch then most certainly you could benefit by running it off of a relay.
http://www.gosperformance.com/inc/sdetail/1983
The GOS Performance harness appears to be a better quality unit but quite pricy at $69
<O
I bought my harness from LMC Truck for $29 part #47-3662
http://www.lmctruck.com/icatalog/fe/full.aspx?Page=67
<O
The LMC Truck harness is made in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com
and came with confusing (to me) “Chinglish" instructions.<O
Can’t say if it would work with HIDs? I have know idea how they are wired.
Most certainly if the power to the HID transformer takes the painfully long small gage circuitous route through the dash switch then most certainly you could benefit by running it off of a relay.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
Likes: 2
From: The boonies by Dallas OR
When I opened up my wire harness to add the relays, I found that not only were all of the wires to the headlights tiny little 18 gauge wires, they also have a bunch of excess wire looped up inside the harness. I'm guessing that this was added to drop the voltage to the headlights down enough to keep the cheap #$@$*!! headlamp switch from burning up.
The brightness increase was very noticeable!
The brightness increase was very noticeable!