Go to your local auto parts store. They sell Hayne's automotive manuals for all makes of cars. Pick out the one that applies to a 1990 Prism, all the wiring diagrams are usually in the last chapter of the book. The books usually cost around $30.00.
Get a wiring diagram to find all that is on that fuse then look from there. Get one from MOTORLIT.COM.
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A do-it-yourself manual for a 1990 Holden Apollo would have a wiring harness diagram. These types of manuals are available at most auto part stores.
http://www.modifiedlife.com/1990-honda-prelude-car-radio-stereo-wiring-diagram/
A diagram for a ford tempo made in 1990 can be found online. It is a coupe model car.
A wiring diagram for a 1990 L8000 is found in its maintenance manual. It can also be found at an auto part store, if the tech will print out the diagram.
Wiring diagram of a 1990 Ford Thunderbird Solenoid. I need a picture of which wire goes where on the side wall by the battery
You can find a stereo wiring diagram for your 1990 Chevy Cheyenne 2500 at most Chevrolet dealerships. The stereo wiring diagram will be in Chevrolet service manuals at your local library.
A wiring diagram for a 1990 GMC 2500 4x4 can be found in the car's owner's manual. You can also find wiring diagrams at auto part stores.
When fixing or changing a radio in a car, a wiring diagram will help make sure things are connected correctly. A wiring diagram for the radio of a 1990 Dodge Dakota can be found in its maintenance manual.
In the Chilton's for it.