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post #1 of 3 (permalink) Old 04-11-2019, 08:59 PM Thread Starter
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trailer wiring/ brake controller

So my 2003 cclb had a 4 wire to a 7 wire plug set up when I bought the truck.
The 4 wires go into what look like a factory harness but I cant be sure.
There is the factory plug under the dash that when I plug a brake controller into it gets power but obviously doesn't connect to the trailer.

So what I need to do it make the 7 pin plug work with the brake controller.

What can I look at to see what I need to make this work.

Is there a new harness that I need? If so where can I get it?


1993 w250 club cab getrag 5 speed 3.55 gears, 2.5" front alcans,305x70r16 BFG A/T, BD fuel pin from thehungrydiesel, HX35, 4" diamond eye straight pipe, hurst shifter, factory tach, egt and boost gauges, round about 350,000 miles
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post #2 of 3 (permalink) Old 04-12-2019, 01:35 AM
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Once you plug a brake controller to that connector under the dash, connect your trailer to the 7 pin and go. It’s all pre-wired and ready to go.

2006 Dodge Ram 2500 ST, RCLB, G56
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post #3 of 3 (permalink) Old 04-14-2019, 02:43 AM
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^^ agree with what he said

'03 QCLB 2500 305/555 NV5600 w/ FastCoolers 3.73 4x4, Color match Lear Topper.
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