88 s-10 blazer starting trouble

Heres a good one .My truck has an intermitant starting problem the ignition willnot engadge at all, and then with out notice it starts. It start 50 times , but it always goes back to the same thing. I have replaced the
ignition switch and the neutral safty switch. all works as it surpossed to. I can't figure out if the purple wire coming off the switch is hot, as it is it has no current
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Purple wire is for Crank signal to starter solenoid.comes from computer goes to 5amp fuse in fuse block.also connects in with neutral saftey switch...that goes to trans. Bobby
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