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F.O. is 1-8-4-3-6-5-7-2. Rotor turns clockwise. Wire from coil to distributor is from negative side of coil. The positive side of coil is for hot wire originating from ignition switch. Always hot with key on.
For vacuum diagram, just google "1967 Buick Riviera 430 cu in, vacuum diagrams" . It is there.
Not sure hat rely you are checking but the blower motor does. To have a relay in the rear fuse block. The fuse you're checking protects the HVAC computer. The HVAC computer uses that circuit to monitor the voltage going to the blower motor.
The most likely problem is the blower motor resistor, aka blower motor module, blower motor speed control. It is typically located near the blower motor. The red wire is power from the battery and should be there all the time. Black is ground. Purple is power to the blower. Grey/black is the speed input from the HVAC module.
COOLING FAN IS CONTROLLED BY COOLANT TEMPERATURE SENSOR (CTS). REMOVE THE CONNECTOR FROM IT AND IT SHOULD STOP THE FAN.
OR JUST REMOVE BATTERYGROUND CABLE.
ITEMS TO CHECK OUT :
CTS,RELAY,CIRCUIT FOR SHORTS.
NOT LIKELY BUT IS A POSSIBILITY, THR ECU.
the cooling fan relay is inside the fan itself
and for any GM parts check out Schram auto and truck parts at www.schramauto.com or call them at 1-800-292-1032
On most GMs, the fan relay is inside of the fan housing. It uses the fan to keep it cool, because the resistors generate a lot of heat. These resistors go bad usually one at a time until all you have left is high speed. You have to remove the fan and there it is! It is a big pain to be upside down, but with a light and a mirror, you can see it easily.
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