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Path: utzoo!linus!security!genrad!grkermit!masscomp!clyde!ihnp4!houxm!mhuxl!eagle!allegra!alice!wookie
From: wookie@alice.UUCP
Newsgroups: net.auto
Subject: Re: Electrical ? Problem
Message-ID: <2385@alice.UUCP>
Date: Wed, 14-Dec-83 12:24:41 EST
Article-I.D.: alice.2385
Posted: Wed Dec 14 12:24:41 1983
Date-Received: Fri, 16-Dec-83 02:17:29 EST
References: <116@GLOBE.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 33

In reference to the blower speed problems:

The multi speed bloweres are made by adding
resistance in series with the motor.  At the
lower speed settings the curretnt draw is reasonable
and so the motor is supplied directly from the
blower speed switch and its associated circuitry (fuse
in the fuse block).  The high speed setting pulls
on the order of 25 amps and so is generally supplied
directly from the battery or alternator via a relay
and a separate fuse usually located under the hood.
Should this fuse blow the motor will still work at the
lower speeds.  Assuming the realsrelays are OK
check the wiring to the battery or alternator and the
associated fuse.  If they check out then seek out
the line which controls the relay.  With a test light
and some pieces of wire you should be able to track
down the problem.

I have had this problem on several cars and in almost
every case the cause was the in line fuse under the hood.
On my '65 POntiac the fuse holder had enough resistance
to cause enough heating to melt the solder in the fuse
rather than blow the fuse out.  I tried so many different
ways to stop the problem that I gave up and resolved
not to use the high speed setting!

Good luck....... If you need further help I have the
complete repair manuals for the 78 Pontiacs and the
80 Firebird so I could help with the wiring diagrams.

				Keith Bauer
				White Tiger Racing