Dead brake lights and weird wiring
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Tuned
Joined: Dec 2003
Posts: 465
Likes: 1
From: Metro DC
Dead brake lights and weird wiring
My dump trailer brake lights and turn signals suddenly stopped working after seven years. The running lights and electric brakes work fine.
I tow with a 2004 F-350. All the lights on the truck work properly.
I'm trying to figure out how to fix this. According to the diagram on the truck connection, facing the back of the truck, and starting at 12 o’clock, the six outboard connections are supposed to be:
#1 12v+
#2 RH turn/stop
#3 electric break
#4 ground
#5 LH turn/stop
#6 running lights
and the center #7 is the backup circuit.
But when I put a volt meter on the connections and get the wife to help, I find that #1 is the running lights, #4 is the constant 12v, and #5 is ground. The other pins remain dead.
So, I have these questions:
1) Do the connections marked on the socket tend to be different?
2) How can I have decent electric brakes, yet find no voltage on the other pins when the wife hits the brake pedal and maxes the controller switch?
3) Where should I first check for the dead brake light/turn signal wires?
Thanks so much!
I tow with a 2004 F-350. All the lights on the truck work properly.
I'm trying to figure out how to fix this. According to the diagram on the truck connection, facing the back of the truck, and starting at 12 o’clock, the six outboard connections are supposed to be:
#1 12v+
#2 RH turn/stop
#3 electric break
#4 ground
#5 LH turn/stop
#6 running lights
and the center #7 is the backup circuit.
But when I put a volt meter on the connections and get the wife to help, I find that #1 is the running lights, #4 is the constant 12v, and #5 is ground. The other pins remain dead.
So, I have these questions:
1) Do the connections marked on the socket tend to be different?
2) How can I have decent electric brakes, yet find no voltage on the other pins when the wife hits the brake pedal and maxes the controller switch?
3) Where should I first check for the dead brake light/turn signal wires?
Thanks so much!
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
My dump trailer brake lights and turn signals suddenly stopped working after seven years. The running lights and electric brakes work fine.
I tow with a 2004 F-350. All the lights on the truck work properly.
I'm trying to figure out how to fix this. According to the diagram on the truck connection, facing the back of the truck, and starting at 12 o’clock, the six outboard connections are supposed to be:
#1 12v+
#2 RH turn/stop
#3 electric break
#4 ground
#5 LH turn/stop
#6 running lights
and the center #7 is the backup circuit.
But when I put a volt meter on the connections and get the wife to help, I find that #1 is the running lights, #4 is the constant 12v, and #5 is ground. The other pins remain dead.
So, I have these questions:
1) Do the connections marked on the socket tend to be different?
2) How can I have decent electric brakes, yet find no voltage on the other pins when the wife hits the brake pedal and maxes the controller switch?
3) Where should I first check for the dead brake light/turn signal wires?
Thanks so much!
I tow with a 2004 F-350. All the lights on the truck work properly.
I'm trying to figure out how to fix this. According to the diagram on the truck connection, facing the back of the truck, and starting at 12 o’clock, the six outboard connections are supposed to be:
#1 12v+
#2 RH turn/stop
#3 electric break
#4 ground
#5 LH turn/stop
#6 running lights
and the center #7 is the backup circuit.
But when I put a volt meter on the connections and get the wife to help, I find that #1 is the running lights, #4 is the constant 12v, and #5 is ground. The other pins remain dead.
So, I have these questions:
1) Do the connections marked on the socket tend to be different?
2) How can I have decent electric brakes, yet find no voltage on the other pins when the wife hits the brake pedal and maxes the controller switch?
3) Where should I first check for the dead brake light/turn signal wires?
Thanks so much!
Steve
New User
Joined: Mar 2012
Posts: 2
Likes: 0
brake lights and turn signals dead
I am having the same issue with my 2008 F-250. It has a factory tow package, and i just re-wired the truck plug. I have no voltage on the tow pins that should turn on the signals and brake lights. Just curious if you found a fix for your truck.
Nathan Loveland
Nathan Loveland
Moderator
Joined: May 2004
Posts: 6,507
Likes: 896
From: Home Base Nebraska
Checkout my thread on a 7 pin plug https://www.ford-trucks.com/forums/1...-cord-end.html the same thing was happening to our trailer.
Denny
Denny
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