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Odd Problem, 1970 L46

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Old Apr 24, 2009 | 12:29 PM
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Default Odd Problem, 1970 L46

Here's an odd one for you. If the heater/blower fan is on, when I turn the key off, the car keeps running. I'm not talking about running-on; I mean the engine keeps running as if the key is still on. If the fan is off, however, when I turn the key off, the engine shuts off. The only electrical change to the car is a new starter motor.
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Old Apr 24, 2009 | 12:47 PM
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Originally Posted by Z06 C6
Here's an odd one for you. If the heater/blower fan is on, when I turn the key off, the car keeps running. I'm not talking about running-on; I mean the engine keeps running as if the key is still on. If the fan is off, however, when I turn the key off, the engine shuts off. The only electrical change to the car is a new starter motor.
FIRE DANGER:

The power wire to the fan motor is often confused for a ground (or vice versa). I believe that the ground for the fan is often wired to the starter solenoid by accident, and would do just as you've described. It is in that location, and appears to go to the starter...but doesn't.

did I mention FIRE DANGER?

Steve
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Old Apr 24, 2009 | 12:57 PM
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as mentioned above, you have a catastrophie waiting to happen... did this just start, or some repair that you did trigger the issue?
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Old Apr 24, 2009 | 01:11 PM
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FIRE!!!??? I'll look at it ASAP.

About a year and a half ago, a "Professional" replaced the starter motor and the problem started then. If I left the fan switch off, everything worked fine so I didn't think there was a serious problem. Sounds like he wired the starter motor wrong.

So, where are the power and ground wires for the fan attached?
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Old Apr 24, 2009 | 02:37 PM
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Get the EZ wiring diagram from Doc Rebuild. I'm pretty sure that the large black wire with a big ring on it in that area looks like it goes to the starter solenoid main terminal...so it is often put on there.

IIRC, it is the ground for the blower motor, and now is straight 12v. But, I might have it backward.

I nearly caught my '69 435 hp on fire this way, as I also had a fuel leak onto my manifold.

More common than you might think, and your "pro" might still be a good resource.

Steve
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Old Apr 24, 2009 | 02:55 PM
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Everybody..............Thanks for your input. I found this thread that should solve the problem: http://forums.corvetteforum.com/c3-t...o-starter.html
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Old Apr 24, 2009 | 08:13 PM
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The term... "professional" mechanic is applied much too frequently. That merely means that they are getting paid for their work...not that they are competent.
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Old Apr 24, 2009 | 08:20 PM
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Everybody.........Thanks for your help. I checked and, sure enough, the ground wire was bolted to the solenoid. I attached it to the bell housing and all's fine.

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