The hazards and turn signals wont work. I have checked, the fuse, hazard switch, turn signal relay, turn signal switch and bulbs, all has power and ground. Still the lights do not work. What else can it be?

You need to check the power with an electrical screwdriver. Start with the turn signals. Did the bulbs blow.? If so there is a serious electric fault and it will get worse. Has the jeep been through flooding? Thearth connections may be damp. You may need to use a hair dryer to fix them.

many lighting systems use two flasher relays to isolate turn signal function from hazard function. each has an independent power supply source path or circuit. you'll need to trace power to the bulbs from the turn signal switch, and from the fuse boxes to the switch.

No need to panic-this can SEEM TO be caused by a couple of things, but it is fairly simple to determine exactly what is causing this flasher circuit condition.
First, turn on your flashers, however you have to do it, and walk around the truck to check that all bulbs are working (at least one on each corner). Turn signal and hazard flasher relays are thermal circuit interrupters and are current sensitive and will not work properly with too few or too many bulbs in the circuit. (This is usually a big problem when switching over to LED lamps, as LEDs only draw a fraction of the current that the bulbs do. This causes the relay to either not flash at all or flash very fast and triggers warning circuits on newer cars) If there is one or more bulbs out, they must be replaced.
That being said, I doubt that alone is your problem. Here is a general automotive wiring primer aimed at the turn signal, hazard, stop, and running lights on most all motor vehicles.
Hazard flashers are required by D.O.T. safety standards on all motor vehicles that may ever be used anywhere near a public road. They are also required to be able to be used without the ignition key. This means the flasher circuit for hazards is fed thru a fuse that connects straight to the battery and is energized at all times.
Turn signal circuits often share the same flasher relay as the Hazards, even though the power for them is switched through the ignition key. Power for directional blinkers connects to a fuse, then the ignition switch, then to the battery.
So, if you have to turn on the turn signals (is the key on?) to get hazards to work, that means they are not getting power direct from the battery, but can get it when the turn signals are on because they both use the same relay. This is usually the case on all vehicles; If 4-way flashers and turn signal are both on at once, the 4-ways override the turn signal and force all signal bulbs to flash. The turn signal never forces one side of the hazards to stop blinking.
So, where does that leave us? You simply have a blown fuse, my friend. The hazard lamps fuse may also power the cigarette lighter, dome light, or other "always on" accessories. This varies with make & model, but the Hazard Lps fuse is usually well marked in the fusebox. If the fuse blows again shortly after being installed, do not put in a larger one! Try one more. If it also blows immediately, there is a problem with the wiring, or a bulb could be in wrong and shorting to the socket ground. Try removing all the flasher bulbs and trying the switch(it won't flash or "tick-tock") again. If the fuse does not blow, you have found the problem. Good hunting!

Always check the bulbs first. Then check for power ant the bulb socket. If the fuses are ok( some have seperate fuses for right and left).......More than likely its a relay wich should be located on or near the fuse panel.The turn signal and hazards usualy have the same type of relay. Swap the turn signal and hazard relays. If the problem is then oposite of what you had before, then replace the relay....

I assume the fuse has power if the hazards work.
The third brake light skips the turn signal switch, the regular brake light circuit goes thru the turn signal switch.
Do you have power going into the turn signal switch on the red lite green wire from the brake switch ?

Yes, it does have a flasher, although it may be a combined unit with the hazard flashers relay. So you hear the clicking of the flasher relay? That seems to indicate the relay is working properly. Have you checked the bulbs and the turn signal fuse? Any turn signal bulbs light up anywhere, front or back?
How about your brake lights, do they work? Your car may have separate, stand alone turn signals in the rear, but many American cars use the same bulb and same filament on the bulb for the brake lights and turn signals. If your merc is like this and the brake lights work, then the bulb must be good.
Turn on the hazard flashers and see if all bulbs work and flash at each corner of the car. This would be the same bulb as for the turn signals. If they work, it could be a bad turn signal switch, may even be the flasher relay somehow malfunctioning, and in a few cases, a bad hazard switch can affect the turn signal switch. Check fuses and bulbs first. If you have any type of body control module that controls lights and other accessories, you may have to investigate that. I know I'm not being very helpful, just throwing out a few suggestions. Good luck.

Did you check to make sure all the bulbs are working? on some cars the flasher for the hazards work even when some bulbs are out but the turn signals will not. If you have blown bulbs replace them and it should work if not then you have one of a few cars that have two relays for the signals, one for hazards and one for turns signals.

the hazard switch above the radio is your problem. if you put on your signals and they don't flash turn hazards on then off and they will flash. (changing this *** will fix your problem

The turn signals run through the hazard switch, I have replaced hazard switches for this problem.

check fuse number 17 in fuse block if ok check bulbs <you said they turn on just don't flash so thats ok> the relay feeds power to the switch cluster but the flasher unit itself is built into the combo switch for turn signal/hazard switch