1990 TBI 350 LTruck.....No Spark

Replaced motor and new starter.....I have no spark.....
I have a 2 wire terminal & the + in center for battery...on solenoid/starter
Is it caused by???outside terminal "I" on starter.??????not
connected.... there was a wire connected to it ... but cant seem to find it......tan/black stripe?????
The other terminal "S" has pink wire connected to it... motor turns over fine but no spark for some reason.... this is a TBI 350 Chevy 1990 k1500 Blazer.... Thanks 1990k1500blazer.................
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