[FC] Problem after installing High Volume Blower Motor

[Larry Forman]

I suspect is is current flowing from the blower power circuit and 
powering the ignition, so the engine continues to run.   The solution is 
to take a power diode with current handling to match the high volume 
blower's current rating.   The cathode (banded side of the diode) needs 
to be connected to the blower or blower relay.   The non-banded side 
needs to be connected to the high volume switch power that is now 
connected to the blower relay.   The diode will prevent current from 
back flowing and powering the ignition.  These power diodes should not 
be over a couple of bucks at Radio Shack.   The diode should be rated 
for maybe 10 amps or whatever the blower is rated for and about 30 volts 
or more.

Larry Forman


On 11/1/2011 3:38 PM, Joel McGregor wrote:
> The diode across the relay coil won't help that symptom.  I'm guessing it will have to be wired differently to fix it.  You may be able to use a large diode in series but they can be expensive if they have to carry much current.  Someone send me a diagram so I can try to figure it out.
> My '65 wouldn't shut off when I left the diode out of the alternator trigger wire.
> Thanks,
> Joel McGregor
>
> ________________________________
> From: LonzoVair at aol.com [LonzoVair at aol.com]
> Sent: Tuesday, November 01, 2011 5:23 PM
> To: Joel McGregor
> Subject: Re: [FC] Problem after installing High Volume Blower Motor
>
> Oh, and Joel, as for my 63 Greenbrier (the one I mentioned earlier today) the fan stays blowing, and the engine keeps running until I turn the fan switch to OFF... although I don't think I ever tried to turn it to low or medium... Oh, and the GEN light comes on when I turn the IGN off but it keeps running.
> Hope this helps (or confuses you) a little.
> Later,
> Lonzo
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