John V.---Using Dan Masters schematics, check that the three heater wires go to
the correct terminal. (Tthe high and low speed wires are interchangeable, which
only makes the pull-out different). If the hot and ground wires are correct,
it would seem that the heater motor itself doesn't want to turn, blowing the
fuse.
Dick
-----Original Message-----
From: John VanNorman
Sent: Tuesday, March 24, 2009 11:54 AM
To: 6-Pack
Subject: [6pack] heater fan blowing fuse
I was working with my father on his 1974 1/2 TR6 this weekend. We
finally got her up and running after an extended hibernation for some
restoration work. After she fired up, we noticed that all the
components running on the green wire (the turn signals,windshield
wipers, fuel and temperature gauge, etc.) were dead.
After some detective work with the help of Dan Master's excellent book
and a handful of blown fuses, we discovered that whenever we turn on
the heater fan, regardless of whether there are any other green-wire
components running, it blows the fuse within a matter of seconds.
I doubt it was the fuse rating on the fuses we were using. It is
supposed to use a 35 amp British fuse and we were using 20 amp
American / Standard fuses. And at one time even tried a 35 amp
American / Standard fuse and it blew that too.
So it seems to me that either the heater fan or the heater fan switch
is drawing too much current. But how would that be possible? Also, we
had all the gauges off during our hibernation work - is it possible
that we could have hooked the heater fan switch backwards (but would
that even make a difference?).
John V.
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