Stick your mom in the engine then START IT UP!!!
It's either a short in the wiring or it's not grounded.
A short in the wiring.
Short in the wiring, or the circuit is overloaded.
Short in the wiring with the steering column.
There could be different reasons the security light is coming on in your Chevy Trailblazer. The fuse could have blown or there could be a wiring short.
I would recommend to check for a short on the wiring to the alternator. Check the fuse box.
There is a short in the wiring or a corroded brake light receptacle.
You have a dead short somewhere, it could be in one of the the bulb sockets, the wiring or the signal switch.
check for bare wires or short in the wiring to the rear lights
Short or incorrect size fuse. Make sure you are installing the correct fuse. If so, look for a short in the wiring.
Bad battery, bad alternator, short in wiring harness, bad accessory always on (radio etc.).
There is a short in the wiring or the fuel pump has locked up.There is a short in the wiring or the fuel pump has locked up.