sound system for 89 bronco II

[Bruce60]

Does anyone know where the power amp for the radio system is located in an 89 bronco II. Also how about wiring diagrams for the sound system?

 

[broncoII2]

the only one that i know of is under the driver seat but you have to be careful once you know its there because you keep geting weater in the truck like me if gets dammaged