when I plug in my batt pack the rc truck wont shut off the motor continues to run. the controller wont work anything. its a fairly new truck only ran it for about a week. I was running it one day and it just stopped working correctly, now with the pack plugged in it wont turn off. anyone got any ideas what it could be ? thanks!

What brand of truck is it?

battery polarity right,
+ to +, - to -?

radio crystals tight in the controler?

controler batteries good?
controler turned on first?

Re-read the radio adjustments in the instruction book and correct as needed, and make sure that you turn on the radio first. Water??? anywhere? Also check the on off switch in the truck, make sure it will actually shut off. Mine got a little piece of dust in it one day and didn't shut off all the way. A little compressed air and now it is fine.

Mechanical speed control? Make sure it is at nuetral before you plug it in. Sometimes things get bumped and can need readjustment. Like Hank said, a little more information would be helpful.