[FC] Problem after installing High Volume Blower Motor

[Dennis Pleau]

I had the same problem until I used the NAPA relay lclc recommended.

Dennis

-----Original Message-----
From: corvanatics-bounces at corvair.org
[mailto:corvanatics-bounces at corvair.org] On Behalf Of Andrew Sego
Sent: Thursday, October 27, 2011 7:35 AM
To: corvanatics at corvair.org
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!"