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The cav kids have been using the wiper circuit for ages. It's a bit simpler than messing with the ignition harness (especially if there are old remnants of starters tied into it, and on cavaliers, there can be a few)
The brown is 'the' main ignition lead, not a separately fused wire dedicated to a singe component, ie the windshield wipers, is the point I was making. As always, tag what you want.