I just purchased an '05 Ram 1500 QC 4x4 SLT w/4.7 L, 3.92 rear. I tow a
popup camper and have a question about the brake controller harness and
factory 7 pin trailer plug.
The truck did NOT come with the factory tow package so all I have is
the flat 4 connector under the bumper. I've heard that the brake
controller plug is under the dash near the brake pedal. When I look
there I see a wiring block near the emergency brake pedal with a blue 4
pin plug. Is this the brake controller harness?
Since I have the flat four, can I purchase a factory 7 pin harness and
if so does it simply plug in somewhere under the truck? I have no
problem wiring up the 12V and brake line if need be - just wondering if
the the truck was pre-wired for the 7 pin plug already.
Don't know if they're similar, but I have a 2004 Dakota without the tow
package. On mine, the 4 wire connector under the dash had all the wires
I needed to connect to the Protege Dodge adapter, but the blue wire did
not go all the way to the rear. On mine, it went to a connector just
behind the left front tire on the wheelwell, a multiple wire connector
that had more wires going into it than coming out of it. (I assume if
you had the tow package, a different wiring harness would have been run
from the front to the rear with the blue wire included). I simply ran a
blue wire from the connector on the wheel well to the rear 7-pin tow
connector and the brakes work fine. If you get the plug-in adapter from
Protege, then you don't have any additional wiring under the dash, just
plug one end in the brake controller and the other in the flat 4 brake
controller connector that Dodge supplies under the dash (mine actually
had a tag that said "brake").
On the rear, you will need a 7-pin plug, but will also need to run the
blue electric brake wire as noted above. Some 7-pin plugs are designed
to plug into the 4 wire plug at the rear, so you have those 4 out of 7
wires connected simply by plugging it in. The blue wire will be the 5th
wire of 7, and you'll have 2 slots left for future use; one for charging
the trailer battery, and I can't recall what the other one is, but I
don't use it on my pop-up.
A previous poster showed a link to Dodge wiring. That's what I used to
find where my wires ran.
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