Heater blower motor help!!
Thread Starter
Burning Brakes
Joined: Aug 2007
Posts: 1,173
Likes: 1
From: Liberty Missouri
Heater blower motor help!!
Ok here we go:
This is on my ’69 vert
I was working on my heater blower motor (that has never worked) I hooked up the original power and the ground wires and here is what happened….Turn the fan switch on and the key on and nothing. Turn off the key and the fan starts running.
I have a diagram and it shows that the ground wire comes off the starter so I am thinking "self you don’t know what is going on in the starter"…..Ok so I will take the ground from the starter off and run a jumper ground and see if the motor works correctly…
Low and behold turn the key on blower motor comes on turn the key off blower motor shuts off. I know what you are saying about now “OK so run a ground and be done with it” 
That would be all right but I need to know for my sanity where and why when wired with the original wires it works backwards. Is it back feeding power from somewhere if so from where? And before you ask to the best of my knowledge the fan switch appears to be wired correct, going by the wiring diagram I have.
This is on my ’69 vert
I was working on my heater blower motor (that has never worked) I hooked up the original power and the ground wires and here is what happened….Turn the fan switch on and the key on and nothing. Turn off the key and the fan starts running.
I have a diagram and it shows that the ground wire comes off the starter so I am thinking "self you don’t know what is going on in the starter"…..Ok so I will take the ground from the starter off and run a jumper ground and see if the motor works correctly…
Low and behold turn the key on blower motor comes on turn the key off blower motor shuts off. I know what you are saying about now “OK so run a ground and be done with it” That would be all right but I need to know for my sanity where and why when wired with the original wires it works backwards. Is it back feeding power from somewhere if so from where? And before you ask to the best of my knowledge the fan switch appears to be wired correct, going by the wiring diagram I have.
Team Owner
Joined: Jan 2003
Posts: 21,234
Likes: 19
From: Freestate Corvette Club! Elkridge, MD
St. Jude Donor '17
To me this simply sounds like a faulty ground. THat can truly lead to all sorts of bizzare behavior. I have had the radio come on when I hit the horn due to a ground issue. Faulty ground can wreak havoc.
Thread Starter
Burning Brakes
Joined: Aug 2007
Posts: 1,173
Likes: 1
From: Liberty Missouri
I am just trying to figure this out so I don’t become one of those “I saw a vette on fire today” posts
