Quote:
Originally Posted by Jason Bourne
...plugged the green wire connector back in and the truck started. It’s possible that when doing that he bumped and moved the NSS or the purple wire connector, and that is why the truck started.
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I think that's what happened.
Purple is for start, green is for backup lights. They are not related.
You may find a wiring diagram handy. Here's one.
https://67-72chevytrucks.com/vboard/...27#post9186727
Year-specific wiring is in the service manuals. I recommend paper manuals, but PDF here for most years.
https://67-72chevytrucks.com/vboard/....php?p=5781194