Fixing non-working windshield wipers....

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Going to get into fixing the windshield wipers that haven't worked since I bought my 1968 C10 a couple months ago. Looked at a few past threads and I figure I have a plan of attack on troubleshooting it but I have two questions-

1. Should a 68 have a one or two speed wipers? Or were both options?

2. Do I have to remove anything under the dash to get to the motor and the wiring attached to it?

Thanks for the help!