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Hy; guys I need to a 72 chevelle with idiot round lights gauges the wiring diagram from switch to the wiper motor because when dash was changed only works in same speed-hy) dont works on low speed dash was from a 71 monte carlo. thanks.
 

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The switches and wiring are different for a 71 switch and a 72 switch. If you have a 72 harness try grounding the switch black wire.
 
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