wiring or the bulbs have corrosion or water in the connetor. Answered in 4 minutes by: 10/3/2011. Sent from my iPhone using Tapatalk On my trucks the trailer light fuses are inside the truck in the fuse panel, which is on the driver side of the dash only accessible when the door is open. My fuse keeps blowing for my running lights on my truck. 2010 f250. No power to truck side of plug. If that does not work, you may have a bad light on the trailer. • Do kids have access to the truck, a helper may have put something in the plug port that is creating the short condition... 2012 F250 Ext-Cab 4x2 Stock PSD-6.7 I recently purchased a 2014 Silverado 5.3L V8 4x4 Crew Cab in order to tow a 22.4' travel trailer around the country. Look at the 7-pin connector (trailer plug) and work your way forward, possibly a wire broke and is dangling near a chassis ground point. If you have a boat trailer with the wiring inside the frame you will need to pull it out to check it. Look for wire grounded out (rubbing) on trailer frame or at lights. Show Less . Re: trailer lights blowing fuses My Grand Caravan has a separate 20A fuse for the stop lamps independent of the turn signal/parking lights. But again thanks for the reply. Interestingly, the fuse does not impact the turn signals or brake lights because those always work, even when the fuse in the truck is blown. I wouldn’t start diagnozing the problem there. Now as soon as i turn the running lights on they blow. I changed it and now my running lights also work. When I turn on the lights in the truck, the wiring harness on the trailer gets hot, and the 30A fuse for the towing tail lights blows under the hood of the truck. 3 Answers. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Usually this lights up the marker lights but this time it blew the fuse instantly. Check for water in the lights. In this video I run down my processes of find a short to ground on a 2005 Nissan Altima that keeps blowing the fuse for the throttle control. The running lights on the trailer are not working, so we found we weren't getting any voltage at the truck harness output. Certainly 20A should be larger enough, do I dare use a 25 amp fuse? I have done everything I can think of. It would be pretty damn odd to have a loose ground blow a fuse…. then I would check for corrosion in the 7round plug on the truck Finally start checking wire on the trailer, especially pay attention to areas where the wire either goes into a wire clamp, or in and out of the trailer frame. 2004 Chevy Express 1500 keeps blowing trailer light fuse If you're only blowing the fuse while the trailer is plugged in, the problem is in the trailer/wiring. The running lights on the trailer last about 5-10 minutes, and then the truck fuse blows. Posted on Aug 02, 2009 Whats my solution? Is this just a bad ground on trailer or frayed wires? Short answer is that you have a positive wire occasionally touching ground. Another way to prevent getting this page in the future is to use Privacy Pass. • Any ideals. Performance & security by Cloudflare, Please complete the security check to access. SOURCE: running lights on trailer blowing fuses in my truck. you obviously have a short to ground on one of the wires to the back (if it was the front the brake shouldn't blow the fuse). Trailer wiring often fails near plug and near light itself. I thought it may have been just a bad fuse, so I replaced with a new one. I dont remember how they abbreviated the name of the fuse, i think the diagram calls it out though. If a wire going to any of the running lights is exposed and touching metal it will cause a short that could blow the fuse. You did run the wires bundled up underneath the hood to where they … I've replaced the harness, replaced the rear lights with LED's (some people said there might be too much power draw), and have inspected the wiring. Removing each of these light housings one by one will be a job and create quite a mess.I am tempted to take back to dealer (2 hours away) for warranty work but prefer to address things like this myself. The truck keeps blowing fuses ( blowing within seconds of putting) for the trailer running lights. Your IP: 51.254.79.111 If it is the tow package running light fuse that is blowing then there is most likely a short in the trailer wiring or in the trailer or vehicle side connector. I definately blew a fuse and/or relay in truck, but something is wrong. Re: Running Lights On Trailer Not Working. They fuse the trailer running lights seperate from the trucks, so if you have a bad connection or ground the connector out, it will blow the trailer running light fuse, but the truck will be fine. I have a 2016 Freightliner Cascade. You may need to download version 2.0 now from the Chrome Web Store. Recommend checking the right side brake/stop light wiring. It will just do the same thing and possibly fry the tow vehicle wiring in the process! I haven't had time to mess around with it yet.

Dan Higher amp fuse not recommended.. Share this conversation. But my trucks are both 04`s the NNBS may be different. Please enable Cookies and reload the page. if you look under the drivers side rear of the truck, down under the tail light there will be a plugin junction. Each of the 10 lights (4 running and 7 top clearance lights) are siliconed sealed onto the trailer. The truck's running lights will work, but the trailer won't if the fuse is blown. running lights on trailer blowing fuses in my truck Running lights on trailer blowing 20 amp fuses in my truck. I knew it must have been a fuse because when I connected the trailer to my sons truck all the lights worked including the running, but on mine only the brake and signal lights worked. Thanks for the help. The easiest way is to just replace the wiring if it comes and goes. Re: Running Lights Fuse Keeps Blowing - Any thoughts? Remove each light one at a time … Cloudflare Ray ID: 60e07dc98d70ee13 … I`ve had these trailer light fuses blow before. I was hoping of a better way to isolate it down to a particular light or at least bank of lights. Performance & security by Cloudflare, Please complete the security check to access. The 20 amp trailer fuse for the trailer running lights keeps blowing after some time. I did the exact same thing as flash1, used the trailer back-up light fuse since my trailer doesn't have them. What is most likely happening is that the trailer light circuit is shorting out somewhere on the trailer frame due to exposed wire touching the trailer frame. The other possibility is that if you added any lights to the trailer that use the running light circuit the extra power draw could be too much for the tow package wiring. A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. If that's not the case, the problem can … • Cloudflare Ray ID: 60e07de02d22d705 Check over all of your positive wires on the trailer for insulation rubbed off/cracked in-line to the lights. Ron, ASE Certified Technician. Started down the road, and 10 minutes in, it blew again. if it only happens when the trailer is plugged in you have a short in the trailer. Check voltage at the back. Slowly cooked the fuse as the radio affiliated. - Ford 2003 F150 Regular Cab question Same thing if the trailer is unplugged. The trailer lights are just R/L Turn sigs and Brake lights. To determine where the short is start by disconnecting the trailer from the tow vehicle. You may need to download version 2.0 now from the Chrome Web Store. A brake light bulb works well. However, it seems that the running lights fuse in the truck is blowing quickly when the trailer is attached. This takes into account that the truck has a factory installed 7 way receptacle. I have a fuse somewhere in my pickup I pulled out of a pursuit edition R**…the upfitter fused a 50W radio (pulls 12A) with a 5A fuse. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Ford Mechanic: Ron, ASE Certified Technician replied 9 years ago. pull this plug-in apart and see if the fuse still blows. I checked the fuse box underneath the hood of the truck and found that the #15 - 20 amp fuse was blown. Mechanic's Assistant: Is the power loss consistent, or does it fluctuate? 30 amp fuse for trailer running lights keep blowing, trailer wiring and lights/brakes all work. Your IP: 217.160.132.104 Another way to prevent getting this page in the future is to use Privacy Pass. We replaced it and the running lights did come on, no problem. Consistant...new fuse pops almost instantly Then the fuse blew a second time. • Only the running lights stop working. I havent tried them on ghe auto setting cause its light outside so they wont come on. Replace the fuse and then use a circuit tester such as # PTW2992 to test the vehicle side trailer connector while someone sits in the vehicle and turns on the running lights. Truck is like new (24k miles) and just developed this issue. Show More. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Repair short circuit in the *trailer lights*... 20 amp fuse is quite sufficient!.. Interestingly we also have an 2001 Expedition with factory tow package that doesn't have this problem. Fuse blows after a couple days at first. That is most likely why your fuse is popping. This problem first appeared a few weeks ago, and I thought I had fixed it by replacing the fuse and installing new Optronics LED tail lights (the old lights had some bare wiring that was causing a short). I still have brake lights and 4 ways and clearance lights. As I understand what you said, the truck lights work initially after hooking up trailer and fuse does not blow. Please enable Cookies and reload the page. I hooked the trailer up and the running lights on the trailer were not on with or without the truck lights being on. Check the truck lights. If it blows fuse 'sometime' after connecting, the brake light would fit that role. the most common problem is usually in a trailer light harness. Apply external voltage to the running light pin on the trailer to see if the lights come up. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. 20 Amps is a huge fuse to be blowing on trailer lights. Dec 21 2013, 3:35am. There was a power converter along with the T-conn. There is a 20 amp fuse in the passenger kick panel that controls the trailer's running lights (brake lights and turns are another circuit) that keeps blowing. I it will steadily blow the fuse you can check continuity at the trailer plug in going from each wire to ground til you find the one with continuity to the ground and that is the one shorting out. I was able to determine it was definitely a trailer wiring issue and not a problem in the truck by putting a fuse across pin 3 and 4 on the 7 way plug. The main ground strap from your trailer frame to your trailer connector needs to be … This time I got out the work light and followed the wiring all the way through the trailer until I found the wire with the insulation rubbed off that was causing the short. Attach a string so the wires can be pulled back through the frame when done. Ask Your Own Ford Question. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. What you will want to do first is make sure both the vehicle side and trailer side connectors are clean and free of corrosion inside and out. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Does this sound like it's on the trailer side? Do I have a truck side short or is there another fuse? If it shows power and the fuse does not blow then the issue is on the trailer.