Upgrading Factory 4 Pin to 4/7 Pin - Ford F150 Forum - Community of Ford Truck Fans



Upgrading Factory 4 Pin to 4/7 Pin

Reply
 
 
 
Thread Tools Search this Thread
Old 06-29-2014, 10:28 PM   #1
Member
Thread Starter
 
Join Date: May 2014
Posts: 42
Thanked 0 Times in 0 Posts
Default Upgrading Factory 4 Pin to 4/7 Pin

I recently picked up a '98 XLT with factory 4 pin towing. I want to upgrade it to 4 and 7 pin plugs. I saw the package you can get from etrailer but didn't want to spend that money if I didn't have to. So I made a trip to my local junk yard and as luck would have it I found a 2000 F150 with a factory 4 and 7 Pin harness (part number yl34-13a576-c321a) and a 7 pin plug. Anyone see any reason why this won't work? I plan on mating it with the combo bracket (YC3Z-14A163-CA). All at a total cost of under $10.

Thanks.
F150-Guy- is offline   Reply With Quote
Old 06-30-2014, 09:47 PM   #2
Grumpy Old Man
5 Year Member
 
smokeywren's Avatar
 
Join Date: Nov 2011
Location: Midland County Texas, just west of the star in my avatar
Posts: 1,904
Thanked 456 Times in 362 Posts
Default

It should work fine if you understand automotive wiring. Your 4 wires are for
1] & 2] left/right turn signal lights, and when both left and right are hot at the same time, that's your stop lights.
3] tail/running lights, and
4] ground.

The three wires you will add are for
5] trailer brake control,
6] hot 12-volt wire to charge the RV battery, and
7] backup lights on the trailer. Some folks use that backup light wire for something else, and most folks don't even connect it to anything (very few trailers have backup lights.)

The trailer brake wire is somewhat complicated to hook up. Do a search on etrailer.com and maybe you can find instructions. The simplest way is to tap into a brake light. If the brake light is on, then the driver wants the trailer brakes to work too. And you must use diodes and resisters and a fuse and all that electronic stuff I know nothing about. So do more research. But knowing what the 7 wires are for should get you started.

Last edited by smokeywren; 06-30-2014 at 09:52 PM.
smokeywren is offline   Reply With Quote
Old 06-30-2014, 11:04 PM   #3
Member
Thread Starter
 
Join Date: May 2014
Posts: 42
Thanked 0 Times in 0 Posts
Default

Thanks smoke. I think I'm ok with the brakes. The harness has 4 plugs. One that goes back to the line that runs to the front of the truck. One for the 4 wire. One for the 7 wire and 1 for the rear brakes. I guess all I need now is the 4 and 7 pin combo bracket (on order from amazon) and maybe a relay or fuse.
F150-Guy- is offline   Reply With Quote
Old 07-01-2014, 10:12 AM   #4
Senior Member
 
Join Date: Dec 2011
Posts: 959
Thanked 136 Times in 110 Posts
Default

My 2001 came with a 4 pin. I bought the 7 pin, bolted it on, and plugged it right in. All of the wiring was already there. Easy breezy.
acadianbob is offline   Reply With Quote
Old 07-19-2014, 10:37 PM   #5
Member
Thread Starter
 
Join Date: May 2014
Posts: 42
Thanked 0 Times in 0 Posts
Default

Finally got around to putting the harness on. Worked like a charm.
F150-Guy- is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Duel fuel tank neither pump will work F150jelly 6 Cylinder Engines 8 12-25-2015 11:11 PM
Towing & Suspension Question RyanCZiegler 2015 - Present Ford F150 19 11-16-2015 04:50 PM
Spent Some Coin On Mods Today BISCUT 2015 - Present Ford F150 7 09-14-2015 11:54 AM
5 lug to 6 lug conversion tech question Mallet 1997 - 2003 Ford F150 19 09-09-2015 08:46 PM
XLT Leather Console Lid? (Console, not Bench Seat) StanF 2009 - 2014 Ford F150 4 09-04-2015 10:40 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:57 AM.


Copyright 2006 - 2016 F150Forum.com