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I have tried troubleshooting and all speeds on blower motor work except high. tried new switch, motor, even checked resistors and fuse on firewall checks ok. any suggestions???
 

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There's an in-line fuse that goes to the relay under the hood. Has an orange wire coming off of it. See if you have 12 volts on that orange wire. Maybe a bad fuse or bad fuse holder that looks ok, but isn't making good contact.
 

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The old "hi-blo relay" failure...

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Mike Newby

69 Chevelle 355/TH200-4R
97 Grand Prix GTP
64 Chevy C10 Pickup
79 Suzuki GS550
 
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