2000 Jeep Grand Cherokee. brake lights would not turn off now battery is dead tried to start it and it will not turn over but there is loud ticking noise that continues even when I take the key out of the ignition.

Could be, might have it programmed first. If still won't start, check for fuel delivery and spark.

Sounds like a dead battery or close to dead. Try jump starting the engine and see if, when it is running, all those symptoms disappear!

if the other light is ok and the fuel gauge is only dead, may be you have no more fuel, try to refill fuel, if the battery is also dead replace new battery.

Your battery is low or has weak cell. I recommend jump starting vehicle. If it jump starts then replace the battery. If
battery warning light is illuminated on dash may have charging
system concern.

Recharge the battery...auto parts store will do it for free if you tell them you would like know if it is good.

Replace the starter...or, if you remove the starter, take it to an auto parts store to have it tested.

could be the brake switch went out of it

The brake light switch is defective or out of adjustment. More than likely located on the brake pedal arm near the top.

something is draning the battery.
it has to be the dash lights the dome lights or something being left in the cig lighters

or the lights arnt turning off after you close the door.
or an after market stereo was installed wrong and or the aftermarket amp.

keep me posted

jm

You have a dead battery. It needs to be replaced. What you hear, are the low voltage relays trying to activate.

Your problem is likely a bad battery and/or corrosion on the battery terminals. Remove the cables from the battery terminals and clean them with a wire brush or other tool. NOTE: always remove the negative cable first and reconnect it last. Reconnect the cables and then try to start/jump the vehicle again. If that doesn't clear the problem, take the battery to your local auto parts store or supplier and have them check it. You will probably need a new one.