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Cars used to use a 6volt coil connected in series with a Ballast resistor that lowered the 12 volt to 6volt to prevent coil burnout. During start-up, 12 volts would be applied to the coil through an additional direct 12 volt wire that bypassed the Ballast resistor. This assured an optimum spark when the large current drain from the starter lowered the battery voltage to something significantly lower than 12 volt. On the General Motors vehicals such as your S-10 this direct 12 volt wire came from the starter R terminal which becomes energized when the switch in the solinoid makes contact. I believe that these Ballast resistor systems pretty much went away when vehicals went to electronic ignition, however don't quote me on that. In your case, if there wasn't a wire already connected, then ignore it. Your starter probably fits many older vehicals that still use the R terminal. If you want to play, you can verify the working of this terminal by connecting a test light from the R terminal to ground. During Start/Cranking the light should light. Good Luck Rick Rohwer

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Q: Does terminal R on '87 s-10 starter need to be connected?
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