<VV> Relay for heater blower motor

[BobHelt at aol.com]

In a message dated 4/23/2008 4:28:55 PM US Mountain Standard Time,  
dfamily at fairpoint.net writes:

The relay and motor seems to work all right but I noticed that the  blower 
motor will shut off on the low and intermediate speeds when the  ignition switch 
is turned off; however, if I turn off the ignition switch when  on high speed 
the motor keeps running until the heater control switch is  turned off.
Is this the way it is supposed to work with a  relay, or do I have a wiring 
problem?  I prefer that it shuts off when  the ignition is switched off.

Dennis Dorogi



Hi Dennis,
Sounds like a wiring problem. First let's check the hookup. The relay has  
three terminals, a normally closed (NC) which is connected to the wire  that 
previously went to the motor, a normally open (NO) which goes to a +12 v  source 
via a fuse, and a common terminal that goes to the motor. OK so  far?
 
Then the relay coil wiring. One terminal is grounded and the other goes to  
the Hi terminal on the heater swirch via a new wire. is that OK?
 
Ok, now with the ign switch off and the heater in the high position, see if  
you have 12v at the Hi terminal either by measuring it or by removing it from  
the relay winding. You should not. Then disconnect the wire that is connected 
to  the NC terminal See if that is what is running the motor.
 
Let me know which of these two wires is supplying the power to operate the  
motor. And we'll go from there.
Regards,
Bob Helt
 
 



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