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2001 Chevy 2500HD turn signals will not work, fuses, bulbs and the relay are good. This happend after I pluged a boat trailer pig tail in, all the other lights work on the truck and trailer.
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I would recommend taking out the tail light. Get a test light, have an assantant step on brake. U will see the bulb in tailamp light up. Probe the wire w/your test lamp. That is brake wire. Repeat that process for blinker.. Drop down those two wires. Hook that to the same side on trailor. Repeat for left and you should be all set.
is trailer lite fixture grounded good try and wiggle fixture when u hit signal. next try wiggle pig tail on trailer , still no signal. it must be wire from truck, trace back to connection and check all splices. to see if signal light works on trailer unhook pigtail and get a battery charger or another battery, connect a jumper from positive side to signal spot on trailer hook up. hook up ground as well see if light works if not its in the truck for sure.
On your wireing pig tail do you have one wire going to your brake lites and one tail lites, Then the ground Make sure you have fourway bulbs in your trailer. Good luck to you.
If the bulbs and the fuses are good, check the brake light switch. You might of shorted out the switch when working on the pig tail. Always use a test light or volt meter when installing pig tails. This way you can check for power and ground before hooking a wire up to help prevent shorts. But by what you have said it does sound as if the brake light switch is now bad.
abad ground on that tail light unit could affect current load when turn and stop are used simultaneously. Although one side only is affected make sure of good grnd between trailer and tow vehicle. focust on the tail light unit in question. Replace the bulb. though rare, bulbs have been known to be the problem. If the bulb is breaking filiments ck the filiment orientation. filiments last longer in vertical orientation, where horizontal permits vibration to break the heated filiment when brake is applied.. good luck and let me know if This helped or not.
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