https://s15.postimg.org/pmp217kl7/ford_ranger.jpg
Click on the link, hope you can read it. The whole diagram was too big.
At the computer, pin one is keep alive memory, should be hot all the time. Pin 5 should be ignition feed, goes hot with the key on.
In the diagram, top right, where it says, power distribution box, check fuse 8--30 amp and fuse 10--80 amp, that last fuse feeds the ignition switch.
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