[FC] Problem after installing High Volume Blower Motor

[Paul Steinberg]

It is where you took the 12 volt connection from.  The power to the starter 
is always there, but the power to the coil is switched through the ignition 
switch.  I would use a switched and fused feed, such as the power feed to 
the radio to power the relay, so you don't have a feed back problem.  Other 
than that, I don't see anything wrong with the installation.  Presently you 
are back feeding the coil which will keep the engine running.
Paul in CT
----- Original Message ----- 
From: "Andrew Sego" <andrew_sego at yahoo.com>
To: <corvanatics at corvair.org>
Sent: Thursday, October 27, 2011 10:34 AM
Subject: [FC] Problem after installing High Volume Blower Motor


>I recently installed a high volume blower fan on the heater in my 63 
>Corvan. I followed the Tech Guide instructions and wired in a relay to 
>control the high speed circuit. The fan works as before in low and medium, 
>and works GREAT on high. The problem I'm having is if I shut the key off 
>with the fan still on high speed the engine will remain running. Sometimes 
>is stays running, other times it will run on for a few seconds and then 
>die. If I shut the key off with the fan switch in the off, low, or medium 
>setting the engine shuts off normally.
>
> The van is mostly original, except the PO wired in an externally regulated 
> alternator. The regulator has been replaced with a solid state unit, the 
> alternator has also been rebuilt this year. Battery is fresh. Everything 
> was working fine before the conversion.
>
> Here are some details about the installation. I made a strap to hold the 
> heater in place with the transaxle cover off. The brown/orange wires from 
> the fan switch were pulled from the plug, left connected to each other, 
> and insulated with tape along the harness. I mounted the SPDT 30amp relay 
> to the heater brace. I have a new wire running back from the heater switch 
> to the coil on the relay. The ground for the coil circuit goes to the 
> chassis, and another ground wire is also installed to the blower motor 
> flange for good measure. Fused power to the relay (terminal 30) comes 
> directly from the positive battery cable connection at the starter. I 
> chose this location for convenience. The original wire that ran to the 
> blower motor was combined with a new wire and connected to the relay out. 
> The new wire of those two runs to the blower motor. Thus the 87 terminal 
> is a junction for both wires.
>
> I'm wondering if somehow the connection at the starter is a problem, since 
> it isn't switched. Also, does is matter which side of the relay's coil 
> circuit is the power and which is the ground? I'm speaking of terminals 85 
> and 86. I don't think it does, just throwing it out there.
>
> Aside from shutting the fan switch off before the key, how do I fix this?
>
> p.s. This reminded of the joke: Man says "Doc, my arm hurts when I do wave 
> my arm like this." Doc says "Okay, that's ease to cure...Don't wave your 
> arm like that anymore!"
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