Heater Blower Motor Mounting, Mine seems to be constant ground due to mounting... Options

[ptravnic]

Hi all,

I have a 72 which does not have the nice U shaped blower motor mount in the engine compartment that the later years have. I'm operating under the impression that this bracket is the early stock mount for the motor assembly:


However, since the ground is supposed to be intermittent (actuates when the red cockpit lever is pulled up all the way) I have the problem where, because the above pictured mount grounds the entire assembly, I'm always grounded causing the blower to start up as soon as I turn on the ignition.

I've tested my ground/red lever as the actuator when the motor assembly is not mounted (thus not automatically grounded) and it works like its supposed to - lever goes up and the motor turns on.

Is there a way to separate the actual motor from the assembly so that it is not grounded when mounted? Maybe the rubber piece in the first pic goes somewhere that I'm obviously missing?


Is there another way to mount the motor assembly that I just don't know of? (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/hissyfit.gif)

Thanks in advance!
-pt

ps - cross posted from the Club site. I'm staying out of the turf wars b/c I like folks on both boards... (IMG:style_emoticons/default/grouphug.gif)

[914Mike]

...
However, since the ground is supposed to be intermittent (actuates when the red cockpit lever is pulled up all the way) I have the problem where, because the above pictured mount grounds the entire assembly, I'm always grounded causing the blower to start up as soon as I turn on the ignition.

I've tested my ground/red lever as the actuator when the motor assembly is not mounted (thus not automatically grounded) and it works like its supposed to - lever goes up and the motor turns on....

Your first assumption that the ground is supposed to switch the motor on is wrong. The ground from the heater switch goes to pin 9 of the front 14-pin connector on the relay board, which ends up at relay 54 pin 86. Pin 85 of the relay gets 12V from the key to power the relay whenever the ground from the switch arrives. The relay supplies +12V to the fan through the green wire to turn it on. The Brown wire from the fan motor goes directly to ground and should be grounded at all times. Relay #54 is the rearmost relay on the relay board.

I've never had to isolate the motor housing from ground, in fact the diagram for a '71 shows the ground wire with a symbol that means the case itself is the ground, while the '73 diagram shows a wire going off the the ground point in front of the relay board.

Either your motor has a short, or someone has done something to your relay. Or you are confusing the Green wire with ground, which is Brown on these cars.