Re: 10.8 Vdc???
Thge electrical power takes a journey from the battery to the rest of the car.
Measure from battery positive post to the hot wire on the wiper connector. Voltage drop should be less than 0.4 volts. If more, then you need to clean terminals. Start at the junction block behind the battery and clean there. Then, jump over to the horn relay underneath the voltage regulator and clean there. Then, separate the firewall connection and clean those. The wiper switch applies a ground when wipers are selected.
Also, a dry windshield adds to the friction to overcome, making the wiper motor draw more power from the battery and this action will drop the battery reading.
Might not hurt to charge the battery also, s/b 12.6 volts for a 100% charge.
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