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Posted by Chris Case on Friday, July 25, 2008 at 00:01:37 :
In Reply to: instructions on using a 4 term solenoid with 3 wires posted by mannyc on Thursday, July 24, 2008 at 23:53:37 :
That one uses an exterior ground, the s&i ones have an internal ground. The 'I' terminal is hot output, only when the starter is engaged.
The external ground type are usually used with w neutral safety switch as the ground. AMC used that system, physically locating the solenoid between the battery and the starter. Later Mopars too, but they called their solenoid a "starter relay", and mounted it between the starter and the tranny.