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My truck has a locking tailgate that goes well with my tonneau cover. It is great to lock things in there. I am just a little confused about how to operate it sometimes. Is the only way to lock it with the key or does it lock when you lock the doors (I have keyless entry)? Even when I don't lock it I still need the key to open it sometimes. I WD40'd it and seemed to make it more consitant, but after a few weeks it is back to normal again. Sometimes it works well, sometimes it doesn't.
Unless someone modified your tailgate with an electric lock, it doesn't work with the keyless entry or power locks. Lower the tailgate and look for any wires going to it. If there are no wires, then it isn't electric. There was a post a few days ago where others were discussing different options for electric locks on them. You can scroll down and find it. As for how to keep it working consistantly, I haven't had any problems with mine, so I can't help you there, but I think you are on the right track with lubricant. However, a lubricant with teflon in it might provide better results, as it tends to stick better and last longer than WD-40.
Check and see if you have a wireing harness going into your tailgate. If you do, there is probably a power lock. I drive on gravel/ dirt roads a lot and I need to lube mine occasionally to keep it working.
Stock OEM is keyed lock only. If it locks by your electronics then someone before you had put a power accuator in to electronicly lock it. About a $100 after market upgrade. Like mentioned earlier here check for wires or take the tail gate acces panel off for look see . . . (also easier to lube the whole unit that way too)
Also, you should use a dry graphite product to lubricate your locks. Silicon based products (like WD-40) tend to attract dust which can clog the lock. Oil based products can attract water which might freeze and prevent your lock from operating.
Thanks guys. I didn't see any wiring harness. My driveway is gravel and with the WD40 it probably mad it worse. I'll lube it with something with teflon.
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