7 blades 5 wires
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Cross-Country
Joined: Oct 2014
Posts: 78
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7 blades 5 wires
I've searched and haven't found an answer to my problem. Son-in-law has a 2010 F250 and recently purchased a car trailer. The trailer has 5 (black, red, white, green, yellow) wires going to a 7 blade plug. From experience and checking the trailer I'm confident that the green and yellow work the turn signals and the white is ground. I suspect the black is power and red is brakes and stop lights. The 250 wiring diagram shows separate wires for brakes and stop lights. Do I need to run another wire to the brakes or stop lights or can I just jump between two blades on the trailer plug to power the brakes and stop lights? Thanks
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
You need a separate wire for the electric brakes. You have to use your brake controller that allows for variable voltage to operate the brakes.
I can't imagine not having brakes on a car trailer. You might check to see if the trailer is using surge brakes instead.
Here's the 7 pin diagram for reference.
Trailer Wiring Diagrams | etrailer.com
I can't imagine not having brakes on a car trailer. You might check to see if the trailer is using surge brakes instead.
Here's the 7 pin diagram for reference.
Trailer Wiring Diagrams | etrailer.com
Thread Starter
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Cross-Country
Joined: Oct 2014
Posts: 78
Likes: 3
The trailer does have electric brakes and the truck has a Ford installed brake controller. The trailer was previously pulled with a 2005 F150 with an aftermarket controller. I suspect the brakes and stop lights worked off the same wire connected to the "brake" spade on the 150's plug.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
The trailer does have electric brakes and the truck has a Ford installed brake controller. The trailer was previously pulled with a 2005 F150 with an aftermarket controller. I suspect the brakes and stop lights worked off the same wire connected to the "brake" spade on the 150's plug.
Follow the wiring back and re-wire properly.
No jerry rigging here.
Mountain Pass
Joined: Oct 2007
Posts: 185
Likes: 1
If the trailer doesn't have backup lights or a battery, 5 wires is all you need. They are:
1. Left turn
2. Right turn
3. Tail light
4. Brake controller wire
5. Ground
The left and right turn signal bulbs are also the brake lights. When you put on a turn signal you are simply flashing the brake light on that side.
1. Left turn
2. Right turn
3. Tail light
4. Brake controller wire
5. Ground
The left and right turn signal bulbs are also the brake lights. When you put on a turn signal you are simply flashing the brake light on that side.
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Hotshot
Joined: Jul 2013
Posts: 14,266
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yes....and with out the brake controller....odds are that the trailer brakes is also stopping the truck
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