NSS / backup lights question

The wiper switch gets power through the accessory terminal of the ignition switch. On the wiring diagram from the 65 FSM the power wire (pink) is designated as V1. The wires going to the wiper motor are labeled V3, V4, V5 and V6 (for the variable speed (for the single speed they are V3 and V6). The wire going to the backup switch (either on the steering column or shifter is B1 - that's the white one. The last wire (if equipped) is the V10 (tan) which goes to through the bulhead connector to the washer pump. Here's part of the under dash harness which shows the wiper switch. Hope this helps.