Brake controller wire?
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Senior User
Joined: Aug 2006
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From: Near Atlantic City, NJ
Brake controller wire?
I found the trailer wire harness on the frame rail over the axle, but it only has 4 wires for the lighting and ground, none for the trailer brakes. Where would I find the brake controller wire under the vehicle? Or do I need to run my own from a controller? It's a 2004 E350.
Senior User
Joined: Dec 2004
Posts: 263
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From: Georgia
Here's a copy of my post after I installed my brake controller.
Here's the link: https://www.ford-trucks.com/forums/3...ighlight=brake
The discussion runs to 4 pages overall. Hope this helps.
Longtime coming, but I finally installed my brakesmart brakecontroller in my 04 E350. I had posted earlier that I had the brake control wires, relays and fuses but did no have the brake control and battery charge wires at the back. Well after spending a couple of hours with the factory electrical manual I found that the first place to look for these wires is Connector 110, pins 1 (brake) and 9 (battery). Connector 110 is the major harness connector just under the drivers area of the van. I got under the van and took connector 110 apart and found out that the wires in question were present in the female (towards the front) connector but not in the male (towards the rear) connector. The places for pins 1 and 9 are blanked off. Here's what I did to hook mine up. I bought 25 feet each of blue (brake) and orange (battery) 12 gauge wire and ran them both from the rear up to connector 110. I punched out the blanks in the male connector. This exposed the orange rubber pin holder. Then, I pulled the red pin lock for the first row of pins out. I pushed the 12 ga wires into their respective holes and out the other side, stripped them 1/4" and tinned the ends with solder. I pushed the wires back into the connector until the tinned wires stuck up even with the other pins and put the pin lock back in. A tinned 12 ga wire is almost the same size as the factory pins so at this point I just put the connector back together and plugged it in. Everything is working great so far.
Here's the link: https://www.ford-trucks.com/forums/3...ighlight=brake
The discussion runs to 4 pages overall. Hope this helps.
Longtime coming, but I finally installed my brakesmart brakecontroller in my 04 E350. I had posted earlier that I had the brake control wires, relays and fuses but did no have the brake control and battery charge wires at the back. Well after spending a couple of hours with the factory electrical manual I found that the first place to look for these wires is Connector 110, pins 1 (brake) and 9 (battery). Connector 110 is the major harness connector just under the drivers area of the van. I got under the van and took connector 110 apart and found out that the wires in question were present in the female (towards the front) connector but not in the male (towards the rear) connector. The places for pins 1 and 9 are blanked off. Here's what I did to hook mine up. I bought 25 feet each of blue (brake) and orange (battery) 12 gauge wire and ran them both from the rear up to connector 110. I punched out the blanks in the male connector. This exposed the orange rubber pin holder. Then, I pulled the red pin lock for the first row of pins out. I pushed the 12 ga wires into their respective holes and out the other side, stripped them 1/4" and tinned the ends with solder. I pushed the wires back into the connector until the tinned wires stuck up even with the other pins and put the pin lock back in. A tinned 12 ga wire is almost the same size as the factory pins so at this point I just put the connector back together and plugged it in. Everything is working great so far.
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