[Kevin Sevcik]

Important questions:
How many wheels and what configuration? Long robot or wide robot?
What size wheels?
Did you chain all your conventional wheels together on one side?

Fast blink on the RSL means you're losing comms, which mean you're dropping your battery voltage extremely low, which means you're drawing one heck of a lot of current. If things work fine with the wheels off the ground, you don't have a short and this is a mechanical issue with your drivetrain. Which, yes, means a pretty hectic Thursday. All the more reason to pinpoint the problem and go in with the right solution.