If it is a standard truck there might be a problem with the back up light switch wich is mounted on the passenger side directly on the transmission. To make sure that that is the problem, you can pull of the 2 wire plug and put your truck in reverse and jump the two wires. You will also need to turn your key but not start your engine. If your reverse lights turn on you know it is the switch on the transmission. Good luck!
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If the fuse blows on different trailers then it's all down to the vehicle. You either have incorrect wiring on the vehicle, a short OR the fuse is not of a high enough value to cope with the additional brake lights? You could try removing all the trailer bulbs EXCEPT the brake lights - e.g. if it's trying to power up the indicators too? That would stop the fuse blowing...... OR remove the brake bulbs from the vehicle & see if it operates the trailer without blowing...... Check the total wattage of ALL the brake lamps & see if the fuse is actually of a high enough rating? Be aware though that increasing the value of the fuse could cause damage elsewhere! As a rough guide a 25 watt bulb will pull around 2 amps at 12 volts - so 4 bulbs may pull up to 8 amps & clearly blow a 5 amp fuse! If in doubt take it to an auto electrician...... The wiring needs to be correctly protected!
it sounds that you have a voltage drop caused by bad wiring or a bad connection for the wiring of the trailer plug. you need to check the wiring of the trailer plug wiring back to were it connects to the truck wiring.pay attention to the condition of the plug connector itself.
Take a 12 volt test light... the kind that has a spring loaded clip to hold the probe into the wire, and insert it into the wire just before the trailer plug, vehicle side. (Blue I think) If there is a connection, the brake should see it and you should have an indicator light. When you activate the brake the test light should lite up. If not, move up to the brake actuator and test the blue wire. If there is nothing at the actuator, check the black wire. It is power to the controller. If no power there, check fuses again. If it does pick it up at the plug, connect the trailer and test the trailer itself. First ground to the trailer and then to the truck. Most problems are ground wire related. Then move to the axle and test it there. For the brakes to work, and even show on the indicator, there has to be a ground and power to the brakes themselves. There are 2 wires to each brake... a ground and a power. Test across both wires to make sure you have power and ground. You can also hook another trailer to your truck or another truck to your trailer. Lights can work through trailer ball ground. Brakes can't. leave the trailer unhooked from the trailer and hook the wiring up and test the lights. That usually will indicate a good or faulty ground. Also make sure there is a GOOD ground to the truck frame/body. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. Hope this helps. Mike
Is your truck wired for a 7 pin flat plug? if so are you using an adapter? The adapters are made differently. One has the center pin as brakes and the other uses the center as Aux. power. Any chance of an animal getting to the wires? They are kown to chew on the wiring. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info.
If you haven't already sprayed plug with penetrating spray or similar (WD-40) then do that first. Next, do yourself a favor, go to a hardware or autoparts store & purchase a 12 VDC test light. (about $5-$10) and it will be one of the best investments you ever made as far as tools go. With it, you can test for blown fuses bad wiring etc. Do you know where I'm going with this as in testing for power in those wires? Start at plug on car, if the power is that far, then it's the trailer side that's causing trouble. If no power at plug on car and your not sure how to proceed, get back to us. You did check for fuses under hood as well right?
Do the truck lights work? If so, look under the back of the truck and check the connection to the plug. See if you are getting power there. Check your owners manual to be sure that the fuses are the "trailer stop/turn" fuses. The truck ones are seperate. Try http://www.etrailer.com/faq-wiring.aspx. Thes should help locate the problem.
try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help. You can take a 12 volt test light and check your fuses also. Touch each side of the fuse on the metal part that is exposed. Use your emergency flashers to do this. The turn signal/brake light fuse will only power when it is in use. Check owners manual as there are probably seperate fuses for the trailer and the vehicle. There is probably a connector under the vehicle near the back... usually above the spare tire that can come loose, but not likely unless it is broken. Hope this helps, Mike
I had this same symptom after I pulled a trailer that had light "issues". I tried wiggling the trailer light connector around until the trailer lights begin working. Next think I know they were not working again and now my left tail light was out. I thought it odd that is wasn't both lights out being on the same fuse, but checked wiring etc with no problems found. Mine turned out to be the "left tail light fuse" in the engine compartment fuse box. All of the parking and tail lights as independently fuse, You can tell which one it is by the guide on the fuse box lid. You will be looking for a 10 amp (red) fuse near the center of the fuse box.