usually the 400 relay (also known as the 4x100), 800 relay
(4x200), mile relay (4x400), and the 2 mile relay (4x800)
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The wiper motor relay is in the box, built on the wiper
motor.
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There are several relay switch is on your 1996 GMC Jimmy. The
brake light relay switch can be found below the dashboard in the
engine compartment.
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The radiator fan relay is commonly located under the hood.
Depending on the vehicle and model, the relay should be in a
distribution box with the other relays.
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Not sure about the relay, but there is a blower resistor
assembly located on the heater case to the right of the blower
motor.