I Have a 91 Toyota 4runner and I have been using my radio system and had it loud then my whole 4runner turn off on me.. Then grabbed a new battery put it in now it doesn't start. Lights are on dash board lights come on, but doesn't start. any ideas? Please help me resolve this issue thanks.

 

Time to break out the multi meter and get some real world voltages

Your Vehicle does not crank??

Cranks but does not start??

Poor connections from dirty or loose battery terminals or you caused a fuse to open some how.

Playing your sound system loud will only drain the battery depending on how much power it draws determines how long the battery will last.