the only way wipers work is on high speed
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1995 Mazda B2300 Question: why do windshield wipers operate only on the high speed setting?
Answer #1Bret Bodas from RepairPal Test Shop, January 07, 2010, 18:27Master
This can be from a bad switch, or the wiper motor, or the circuitry in between. If you can, get a wiring diagram and a test light and diagnose the circuit, otherwise it's best to let a shop diagnose it to avoid replacing unneeded parts.
You might find a free wiring diagram here: http://bit.ly/autozone_repair_info or go to http://bit.ly/alldata_repair_manuals or http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.