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You did not state which engine. The 6 cylinder was carberated so does not have fuel injection. The 4.oL fuel injection was first put in 1991 Wranglers 6 cylinders. The 4 cylinder for 1990 had a throttle body injection (similar to a carberator except the computer "injects" fuel into the air stream as it passes- different from multipoint injection where fuel is injected directly into each cylinder- hence multipoint designation). My Haynes manual says that on most 87-95 models, the relays are located next to the battery. There is also un under hood fuse center it might be in or even could be in the fuse block, but more likely under the hood.
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