Ventilating System no blow!, What am I missing? Options

[jsaum]

I'm trying to get everything working on my 72 914 including the fresh air blower and defroster control on the dash. I traced down the power going to the control selector lever for the three speeds, the red & white wire which does have 12 volts but it doesn't connect to anything! Am I missing a connector or a wiring harness that gets power to the blower motor from the dash? There isn't any bulbs or holders for the red and blue bezels on the control panel it seems like there should be more there!

Thanks for the help!

Jsaum

[BeatNavy]

I tore into my '72 fan housing too look at the resistors and other connections. Here's a picture of the resistor springs. When I measure the resistance across each, I got something from 4K to 8K ohms (the multimeter bounced around).



Here are the corresponding 4 posts on the outside. One, I think the upper right, is the 12v input. The others are ground connections that connect from the climate control grounds in the dash through these resistors and to the ground connection at the actual blower motor.



With the blower in the housing I was able to "bench test" it on the battery by connecting a 12v jumper to the upper right connection and then use a ground wire at the other connections. I found I had something like a slow speed when I grouned the right lower pole and a high speed when I grounded the lower left pole. Not sure how I was supposed to get a mid speed.

Then I hooked it up to the connector under the hood. Here's where the fun started. I get a little smoke when I put the climate control selector on low, a LOT of smoke when I put it on mid speed, and good, solid blower action (and no smoke) on high. Obviously I'm shorting something to cause the smoke. I'm not sure what gives. Need to think this through some more. Smoke near the fuel tank is not an ideal feature.