1994 Toyota Pickup Audio problems

Are you sure everything is properly connected? Keep in mind, I have no idea what kind of radio you installed or the speakers. However, I know they all require a power source, a ground, and there are specific wires for each speaker.

Does the radio turn on?

If the radio isn't turning on at all, either you have no power to it, there is no ground, or the radio itself is bad. Are you sure you have power and it is connected to the correct wire? Also, is there a ground anywhere?

Do you have a volt meter or a test light? If so, see which wire is the power supply. Then, look at the wiring schematic that came with the radio and determine which wire is for power. Once you do that, let me know and we'll move on.

I wish I could help more, but I have no idea what radio you have, the wiring harness you have. Regardless, you need to first identify which wire from the car is a power supply then determine which wires are the car's speaker wires, and if there is a separate ground. Once that is done, you need to do the same with the radio. It should have come with a wiring schematic with the directions or maybe there is a label on the radio identifying which wire does what. Once all wires are identified, you need to connect them together. For example, the power supply from the car goes to the radio power wire, LF speaker wire goes to the LF speaker wire on the radio and so on.

Let me know what I can do to help.