oodiee Posted November 4, 2012 Share Posted November 4, 2012 Hi i have a 96 ch700-713 dump truck that i bought from a widow was a one owner etc.. It was set up for air brakes and a semi plugh in back . I switched it to the 6 pin round plug also put in the brake controller.. My problem is we have tried EVERYTHING i have singles 4 ways and marker lights . And even the brake controlers works perfect .. the problem is we can not get brake lights on the trailer !! The trailer i 1 yr old econoline trailer and it has a 5 wires the truck has 6going to it.. Does anyone have an idea what the heck i am doing wrong? Is there a brake switch we should be hooking into on the truck? Thats what i think is wrong ? Any help would be great thanks jerel Quote Link to comment https://www.bigmacktrucks.com/topic/28154-no-brake-lights-to-trailer/ Share on other sites More sharing options...
pmolitor Posted November 5, 2012 Share Posted November 5, 2012 The trailer sounds like.it is set up for being towed behind a pickup or lighter duty truck that has the turn signals and brake lights on the same circuits. I'll have to look how I set mine up to overcome that problem. Give me a couple of days. Quote Link to comment https://www.bigmacktrucks.com/topic/28154-no-brake-lights-to-trailer/#findComment-144525 Share on other sites More sharing options...
farmer52 Posted November 5, 2012 Share Posted November 5, 2012 Did you connect the brake controller "brake wire" to your vehicle brake light circuit? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/28154-no-brake-lights-to-trailer/#findComment-144528 Share on other sites More sharing options...
RowdyRebel Posted November 5, 2012 Share Posted November 5, 2012 The trailer has 5 wires...what are they? Most likely:GroundTailLeft turn/brakeRight turn/brakeElectric brakesThe truck has 6 wires...typically those are going to be:GroundTailLeft turn/brakeRight turn/brakeElectric brakesAux. powerA 7-round "RV" style plug would haveGroundTailLeft turn/brakeRight turn/brakeElectric brakesAux. powerReverseNow on a commercial vehicle, the 7 round plug has:GroundLeft TurnRight TurnTailMarkerBrakeABSIf you want you turn signals to operate the brake lights, your best option is to tap into the rear tractor light circuit to get the power to your 6-round plug for the turn signals, since the tail lights on the tractor operate in the same dual-function manner (turn/brake lights). Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/28154-no-brake-lights-to-trailer/#findComment-144532 Share on other sites More sharing options...
RowdyRebel Posted November 5, 2012 Share Posted November 5, 2012 Did you connect the brake controller "brake wire" to your vehicle brake light circuit?That isn't a very good idea, since the brake controller is supposed to translate brake pressure into an electrical signal which tells the brakes how hard they need to apply. If you wire the brake lights into that same circuit, the brightness of the brake lights will vary...the harder you apply the brakes, the brighter the lights will be. It would be better to tap into the proper circuit in the truck to control the turn/brake lights. Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/28154-no-brake-lights-to-trailer/#findComment-144534 Share on other sites More sharing options...
farmer52 Posted November 5, 2012 Share Posted November 5, 2012 That isn't a very good idea, since the brake controller is supposed to translate brake pressure into an electrical signal which tells the brakes how hard they need to apply. If you wire the brake lights into that same circuit, the brightness of the brake lights will vary...the harder you apply the brakes, the brighter the lights will be. It would be better to tap into the proper circuit in the truck to control the turn/brake lights.I remember connecting a wire to the brake switch at the pedal. But this was a pickup not a semi. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/28154-no-brake-lights-to-trailer/#findComment-144537 Share on other sites More sharing options...
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