Flashers won't turn off

Did you check the dash fuse block? fuse #12?
also maybe the brake fuse.

2000 Nissan/Datsun Truck Quest Mini Van 3.3L SFI 6cyl

Flashers

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The turn signal/hazard lamp flasher is located behind the driver's side of the instrument panel to the right of the steering column.on the fuse block
REPLACEMENT

1. Disconnect the negative battery cable.
2. Locate the flasher assembly under the driver's side of the instrument panel. Press the tab on the flasher and slide it from the bracket.
3. Detach the flasher from the electrical connector and remove the flasher from the vehicle.
4. The installation is the reverse of the removal.

More than likely the electronic turn signal flasher is defective.
Instructions

1. Remove the Old Flasher Relay
   • Using your socket wrench, disconnect the negative cable from the car's battery terminal. The negative terminal and cable are identified on the top of the battery using the minus ("--") symbol. Once the cable is disconnected, wrap the metal end completely with the black electrical tape. Lay the cable down and make sure it's not touching any metal surfaces.
     
   • 2Open the driver side front door and kneel or position yourself so that you're able to see under the dashboard.
     

   
   

   • 3Locate the automotive flasher relay under the dashboard on the right-hand side. The flasher relay is about the same size as an ice cube. It will be held in place by one screw and will have a three-pronged wiring harness connected to it.
     
   • 4Remove the screw holding the flasher relay in place and slowly lower it from underneath the dashboard.
     
   • 5Hold the flasher relay in one hand, and with the other hand gently disconnect the wiring harness plug from the relay. Never separate the flasher relay by pulling the harness off by the wires, always hold the plastic harness plug itself.
     
   Install the New Flasher Relay
   • 6Inspect the new flasher relay to make sure it isn't damaged. Hold the new flasher relay and the old one side by side and compare them, ensuring that they are exactly the same.
     
   • 7Carefully plug the wiring harness connector into the new flasher relay. Make sure no other wires are intertwined as you raise the flasher and harness back into position under the dashboard.
     
   • 8Secure the flasher relay by returning its mounting screw.
     
   • 9Unwrap the negative battery cable's connector and reattach it to the car's battery terminal. Turn the power on or start your car and test out the new flasher relay to make sure it's working properly
     

The Combination Flasher, also refered to as the combo-flasher, is mounted to the in-line bracket which is located to the right of the Junction Block. The Junction Block (JB) is located in the left endcap of the instrument panel. REMOVAL Open hood and disconnect the negative battery cable remote terminal from the remote battery post. Remove the left instrument panel silencer. Refer to Body Instrument Panel Silencer, REMOVAL. The flasher can be removed by pulling in a rearward direction. INSTALLATION Install the flasher by firmly pushing it into place. Install the left instrument panel silencer. Refer to Instrument Panel Silencer, INSTALLATION. Connect the negative battery cable remote terminal to the remote battery post.

Did you try jumping it off with another car?? It sounds like it may have a loose ground cable. make sure the battery is good, make sure the cable ends are clean and tight, check ground cable on engine block. Hope this helps you...

The battery won't go dead while you're driving the car.
It's utterly impossible for anything to operate with the battery cables disconnected.
There's probably an internal short in the solid state resistor that controls the blower motor.

REMOVAL

1. Disconnect and isolate the battery negative cable.
2. Remove the fuse access panel by unsnapping it from the driver side end of the instrument panel.
3. Remove the combination flasher from the junction block.

INSTALLATION

1. Position the combination flasher in the proper receptacle in the junction block.
2. Align the combination flasher terminals with the terminal cavities in the junction block receptacle.
3. Push in firmly on the combination flasher until the terminals are fully seated in the terminal cavities in the junction block receptacle.
4. Install the fuse access panel by snapping it into the driver side end of the instrument panel.
5. Reconnect the battery negative cable.

Flashers - REPLACEMENT

Turn Signal Flasher
(see Figure 1)



Fig. 1: The turn signal flasher is located on the multi-function switch in the steering column

1. Disconnect the negative battery cable.
2. Remove the upper and lower steering column shrouds.
3. Pull the flasher from the back of the multi-function switch.
   

To install:

1. Install a new flasher in the multi-function switch.
2. Install the column shrouds.
3. Connect the negative battery cable.

Hazard Warning Flasher

1. Disconnect the negative battery cable.
2. Remove the knee bolster panel from the underside of the driver's side of the instrument panel.
3. Grasp and pull the flasher from the connector located near the top of the steering column.

To install:

1. Install a new flasher in the connector.
2. Install the knee bolster panel.
3. Connect the negative battery cable.

Hope this help (remember comment and rated this).

Indicator Flasher The turn signals and the hazard warning flasher switch (13A350) use the same indicator flasher (13350). The indicator flasher is located behind the instrument panel (04320), to the right of the interior fuse junction panel. When activated, the indicator flasher flashes the appropriate turn signal lamps.

Removal

1. Disconnect the battery ground cable (14301).
   

1. Press the indicator flasher tab and slide the indicator flasher from the mounting bracket.
   

1. Disconnect the indicator flasher electrical connector from the wiring harness.
   

I believe it is your factory anti-theft system. check your owners manual for how to disengage same.