I have a 1998 dodge ram 4x4 5.9 liter i have no brake lights or turn signals i changed the fuse it blows it as soon as i press the brake

Check wire harness connection between bed and cab

first thing to do is check your fuse for your signal lights as your hazzard lights are on the same circut! on the left of your dash by the drivers door is a access door that pops off a print out of the fuses is on the fuse door use tweesers to pull the fuse out! use a 15 amp fuse!

Hazard switch might be on

The ground wiring on newer vehicles is a little complicated. Older cars, the ground would have been to the body around the tail-lights, but these have a ground wire in the harness and is connected to the turn-signal switch, and other sources. I don't think you have a ground problem. Does the fuse blow as soon as you press it into the fuse-block, or when you step on the brake? I believe you have a dead short somewhere, possibly a pinched turn-signal wire close to the tail-light assembly. Brake lights work through the turn-signal wires from the turn-signal switch on the steering column. That's how you can have one side blinking for turn while the other side stays on for brake. I'm kind of shooting in the dark here because I don't know what all you've done. If you replaced the turn-signal switch in the steering column, you may have pinched a wire or something there. Another thing, if the fuse doesn't blow as soon as you press it in, will both turn-signals work as long as you don't press on the brake? If you can provide a little more information, I might be able to help you more. One last thing....Have you replaced tail-light/turn-signal bulbs? If so, be sure you used the right bulb. You should only have two bulbs, one for back-up lights and one 1157-type combination for tail-lights and turn-signals. I have seen people use a single contact (1056) bulb in place of a 1157, which creates a short from brake/turn-signal back into the tail-light circuit. I do have a 1994 Dodge Dakota.

check the wiring after the fuse to see it there is any where it is touching earth. The brake light switch under the dash at the top of the brake pedal would be a good place to start as the live wire may be off and touching the metal.

Walker Muffler - Aluminized Steel Direct OE Replacement 1998-2001 Dodge Ram 1500.-------------------------------------------------------------------------------------
SLIM HID XENON light

If i remember right those have tail light ciruit boards might be a short in that,

look for voltage coming to the signal switch, from two sources one live one from the brake pedal , then from the switch out

There is a conector box on the left side of your steering wheel on the colum loosen it and check your wires I bet when you just loosen the block they will start working,I hope this helps you

left side u got a short
u can wire up a buzzer or light to plug into where the fuse goes that blows when u turn on ur left blinker the buzzer will sound or the light will come on ,while the buzzer is on take apart left signals
and check wiring by moving harness around ,when u find the short the buzzer will quit