The small wire should be a fusible link wire and it attaches to a junction block close to the backside of the passenger headlight on the backside of the radiator support. You may have to take the battery out to access this junction block.
This small wire is the main feed for the car. On the junction block you will attach this small wire from the battery positive post and then another wire will also be on the junction block and this wire goes to the horn relay.
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