bdg

Hi guys fng here first post. I'm working on 72 cutlass trying to get blower motor to work.Going behind other people wiring is a nightmare.Spagehti undfer dash.Question is i have a 2 wire connector under dash female both wire are purple.I can power one and blower runs on high.The connector is by the steering colum were does it plug into. to get the motor to work when i turn the switch on.

BSiegPaint

That sounds like your clutch neutral safety switch wiring - it keeps you from starting your car without the clutch depressed. Do you have a 4-speed?

BSiegPaint

Get on eBay and find a Chassis Service Manual for your car - it will contain all the wiring diagrams you need to trace these wires and help you figure out what you have under your dash - plus a thousand other things you'll need to know as you go through your car.

joe_padavano

As noted, the connector with two purple wires is for the neutral safety switch (or clutch safety switch for a manual trans). If powering one of those makes the fan motor turn, you have much bigger wiring problems. How about you tell us more detail. For example, is this an original floor shift car or a column shift car that was converted? Is the backdrive linkage from the trans to the steering column still in place? Does (or did) the car have A/C or heat-only? All of these questions affect the wiring.

oldcutlass

The only other 2 wire connecter with a purple wire that's inside the cabin is the turn signal flasher unit by the steering column.

joe_padavano

Sorry, that is not correct. On the OP's 1972, the only two terminal connector with two purple wires is the NSS connection, as stated above. The turn signal flasher pigtail has one purple and one green/white wire, as shown on the 1972 wiring diagram.

bdg

The car has ac looks to be original it was column shift i believe originally.It now has aftermarket floor shift.The vin number is 3J67H2M219115.TIA

oldcutlass

I believe thats what I said, that it only had 1 purple wire. Its dark under there and people do mistake wire colors all the time. Either way getting the blower to come on by applying power is a stretch in either case.

joe_padavano

You did, sorry. I read it too fast and missed the word "other".

The H in the VIN says that the car was originally a 350 2bbl. Can we assume that the aftermarket floor shift means that there is no linkage from the trans to the steering column and that your stock neutral safety switch has been bypassed? Does the car start in any gear?

To your original question about the blower motor, the A/C cars used a high speed relay mounted on the firewall. There will be a purple wire from the blower motor to the relay. A black/orange wire with a 30A inline fuse runs from the threaded post on the horn relay to this high speed blower relay and provides power to the motor for high speed only. At all other speeds the motor gets power from the resistor in the HVAC box (the blue wire that runs from the resistor to the high speed relay), which in turn gets power from the HEATER-A/C fuse on the fuse panel.