Please help.I have a 2005 Dodge Caravan.When I start the van the rear break lights would turned on automatically.When I step on the break the lights stays the same,no indication of breaking from the rear lights.

Don't remove the bulb. The problem is the switch

no help has to be checked out by elec person

Warranty should be taking care of this problem, but look for missing or damaged rubber parts in the 'anti-roll-bar' mechanism and the rear shock absorber ends. It would help to identify which end of the car it is coming from. Make sure the sliding doors fit tightly. Try 'bouncing' the van at each corner to help identify the noise. The front struts could have an internal problem. Try shaking the front and rear wheels when on the hoist. Hope this helps!

alternator bad??? causing a drained battery

Rear open hatch. Remove 2 retaining pop fasteners, turn taillight towards outside of van. Don't break hook(tab) on the light assembly. Squeeze the tab on bulb pull bulb straight out. Check hook grommet on van. Replace if cracked can cause water leak on van

well start by opening the rear door hatch, then use flathead screw driver and on the inside of the lamp assembly pry off two black clips and then pull assembly off of the van. twist light bulb out and then replace. revearse procedure and you are done.

Your Caravan has no rear differential. The van is a front wheel drive, you may have a bad brake or your spare tire under the back of the van is lose. the other thing to look for in the back is the rear shocks could be broken or lose. Good luck and keep me posted, be glad to help get your van running 100% again soon. 

First, keep in mind that as you begin to remove these doors you run the risk of causing serious scratches to the paint and glass, so put some masking tape and/or plastic sheeting around both sides of the door (rear quarter panel and rear glass, front door and front door glass)
I would get a Haynes repair guide since that's what I have to work from and it will tell you step by step with pictures, what to do. It's not hard, but you need to get all of the attach points unhooked to be successful. Suggest you have a helper working with you to keep the door steady.

It won't let you. I have a 2005, and a 1997 and my parents have a 2000 and you can't. You can however turn off the auto-lock when your car is in motion. You turn the car to the "ON" postion with out starting it, and then to the "OFF" position 4 times. Then press the lock button. It will chime. Then that should be deactivated.