7 way wiring
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New User
Joined: Oct 2003
Posts: 22
Likes: 1
7 way wiring
So I'm wiring a 71 F250 for tow. I have a Draw Tite Activator II controller. I will be towing a Haulmark 24' trailer (20' box) and has a seven pin plug and electric brakes with Batt.
The 7 way connector wiring
white to ground
Blue to Controller
Green, Red, Brown lights
Yellow Center Aux (what is this used for)
Black to Battery Charge (Does this wire connect directly to vehicle batt to charge Trailer batt, or do I hook wire to Alternator.
The 7 way connector wiring
white to ground
Blue to Controller
Green, Red, Brown lights
Yellow Center Aux (what is this used for)
Black to Battery Charge (Does this wire connect directly to vehicle batt to charge Trailer batt, or do I hook wire to Alternator.
Senior User
Joined: Mar 2003
Posts: 140
Likes: 0
From: Hamilton Ontario
Try this site..you need to have adobe acrobat reader installed on your system to read it. I think the centre is used for backup lights, not 100% on that , but here`s your wiring.
http://www.firestoneairbag.com/websi...en%20Hitch.pdf
Sty
http://www.firestoneairbag.com/websi...en%20Hitch.pdf
Sty
Posting Guru
Joined: Aug 2002
Posts: 1,729
Likes: 2
The center post on a 7 pin plug is for backup lights, the aux pin (your battery charge) supplys the batt on the trailer 12v from the truck battery. You need a circut breaker!! I belive it's 20amp.
The wiring your describing...is this the way the trailer is wired or the way you are wiring your plug?
The wiring your describing...is this the way the trailer is wired or the way you are wiring your plug?
Elder User
Joined: Feb 2003
Posts: 673
Likes: 0
From: Virginia
Here are the standard wiring diagrams. Center pin (yellow) is aux on 7 way plug. Just fyi, be careful with 6 way connectors as there are 2 ways of wiring up.
Wow, that didnt work, i can email it to whoever wants it.
on 7 wire, (looking at plug on truck (female end))
white:ground (7 o'clock)
Blue:electric brake (5 o'clock)
Green:Tail & license (11 o'clock)
black:battery charge (1 o'clock)
red:left turn/stop (9 o'clock)
brown:right turn/stop (3 o'clock)
yellow:aux (center)
Wow, that didnt work, i can email it to whoever wants it.
on 7 wire, (looking at plug on truck (female end))
white:ground (7 o'clock)
Blue:electric brake (5 o'clock)
Green:Tail & license (11 o'clock)
black:battery charge (1 o'clock)
red:left turn/stop (9 o'clock)
brown:right turn/stop (3 o'clock)
yellow:aux (center)
Last edited by f350xlt460; Mar 16, 2004 at 04:34 PM.
Elder User
Joined: Feb 2003
Posts: 673
Likes: 0
From: Virginia
OBTW, i dont think the Haulmark trailers use battery charge (at least my 20' enclosed doesnt) Center pin isnt used. The battery charge pin is what powers the lights inside the trailer. Use a test battery and make sure that your trailer is wired the way you want it (wether center is battery charge (if used) or interior lights or back up lights)
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