RedBullDog Posted January 13, 2015 Share Posted January 13, 2015 (edited) OK Gurus, here's one that i need help on. I have brake lights at the tractor but there is no power to the brake lights in the trailer pigtail. I have checked the fusebox on the passenger dashboard where the glovebox would be and the small one by the steering shaft under the hood. Are there any additional fuseboxes I have overlooked. Since I have brake lights on the tractor I assumed the brake switch must be good, but is there a seperate one for the trailer maybe? Truck is a 2001 CH613 Edited January 13, 2015 by RedBullDog Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/ Share on other sites More sharing options...
Superdog Posted January 13, 2015 Share Posted January 13, 2015 are you 100% sure your power cord is good,that would be first place I'd check Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274081 Share on other sites More sharing options...
RedBullDog Posted January 13, 2015 Author Share Posted January 13, 2015 Yes, that was my first try. There is no power to brake lights at the plugin mounted on the chassis, and if you follow it to under the hood there is no power at the little row of hookups for the trailer wiring. thats why I thought fuse or switch. But I never saw a fuse designated for trailer lights on the passenger dash and the giant one on the firewall under the hood is good. Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274082 Share on other sites More sharing options...
gearhead204 Posted January 13, 2015 Share Posted January 13, 2015 I haven't worked on one that new with that problem but I would follow the air lines from the trailer brake hand valve and I would guess there will be a pressure sw. tee. in the application line that's where I would look to see if maybe its faulty. that is after checking all fuses/circuit breakers Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274095 Share on other sites More sharing options...
57 bcr Posted January 13, 2015 Share Posted January 13, 2015 I took a Navistar dump truck to the dealer for a buddy the other day. He tried tracing the wires for a no turn stop/turn//tail lights to the back of the truck. He pulled his hair out. He called the Navistar dealer and the service manager suggested he bring it by. Thought they could just reprogram the computer,but had to REPLACE the computer to get the stop/turn/tail lights to work again! Don't know what that cost,but I'm sure it wasn't cheap! Al Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274100 Share on other sites More sharing options...
j hancock Posted January 13, 2015 Share Posted January 13, 2015 That is sad. Lights through the computer...Never had a good old Signal Stat 900 clamped to a column fail.If one did, $50.00 got a new one. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274102 Share on other sites More sharing options...
Popular Post 57 bcr Posted January 13, 2015 Popular Post Share Posted January 13, 2015 I know,Jim. Very sad. Used to check my lights out every night when I parked. 9 times out of 10,a burned out bulb,fuse,or broken wire was the culprit and I fixed on the spot for little $$$. I remember when electronic ignition came out ('70's) and we all screamed that "the car companies don't want you be able to work on this stuff yourself,anymore". Little did we know that was just the tip of the iceberg! Al 3 Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274117 Share on other sites More sharing options...
RedBullDog Posted January 14, 2015 Author Share Posted January 14, 2015 I've got an update, after crawling under the truck and trailer to grease slacks, I mashed the brake pedal hard 3 or 4 times. The last press i heard a sound like rushing air. I went to the back to see about the sound and saw trailer brake lights on, I tested them several times and they are working every time. Maybe there was a blockage in the air line to the brake switch? Anyway, prayer answered. Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274351 Share on other sites More sharing options...
1957B61Vt Posted January 14, 2015 Share Posted January 14, 2015 Navistar. !Yeah my 2013 workstar Did that no lights at all on rearBad connections high resistance burntUp module because guys who put dump body,plow and wing on itDidn't do best job sealing it up .so 1400.00 later lights working again I had everything at trailer plug so if it happens aginProbably put in a junction box and run off trailer harness Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-274356 Share on other sites More sharing options...
Xepshunall Posted October 24, 2019 Share Posted October 24, 2019 I can tell you that if this happens to me, I'm gonna put a relay in line with the pigtail recepticle and feed it off a good source of +12v and send the "signal" to the relay from the tractor brake lights wiring. To Heck with computer swapping for a simple and cheap repair that a minor modification can safely fix.. Quote Link to comment https://www.bigmacktrucks.com/topic/38389-no-power-to-trailer-brake-lights/#findComment-434465 Share on other sites More sharing options...
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