I have a V 150 SE crunch amp. i have a red light

No blown fuse. Try powering up without speaker wires hooked up to amp. If u still have a red light, then output of amp is bad.

If you have a red protection light, you probably don't have a blown fuse. If you had a blown fuse you wouldn't have any light. However, you probably have a bad output section. If you have a multimeter check to see if you have a dc voltage on the speaker terminals when you first turn on the amp. You can check by placing black lead on neg speaker terminal and red on positive speaker terminal. It will be quick will probably need 2 people to test this. More than likely you have a blown transistor/fet in output section.

This more than likely means that you have a blown fuse. Go to an electronic store and replace the fuses. Make sure you get the exact same sizes and types that you had before.