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Bill_MN 
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Joined: 12 Sep 2009
Location: Sioux Falls, SD
Points: 1471
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 Topic: blower motor amp draw
Posted: 27 Aug 2018 at 9:34pm |
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Hey guys, took my '89 mustang out for first time in a couple weeks and when I turned on the vent the blower motor was running slower than usual, and it pulled my voltmeter down a good bit, less than 13 volts though I don't have my multimeter here right now. I didn't have this issue the last time I drove it, what could change suddenly like that from sitting? I'm thinking bad blower motor or resistor, battery was new last spring and alt was replaced a few years ago with not many miles. Going on a fairly long trip next week so trying to catch it early if something needs replaced.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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HD6GTOM
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Joined: 30 Nov 2009
Location: MADISON CO IA
Points: 6627
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Posted: 27 Aug 2018 at 11:27pm |
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Sons 2010 ford did the same thing, blower motor was bad. It took all of 20 minutes to replace it. His 17 year old son replaced it.
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shameless dude
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Joined: 10 Apr 2017
Location: east NE
Points: 13607
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Posted: 28 Aug 2018 at 2:55am |
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partial mouse nest?
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Stan IL&TN
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Joined: 13 Sep 2009
Location: Elvis Land
Points: 6730
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Posted: 28 Aug 2018 at 7:18am |
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Will turning on the headlights cause the voltmeter to drop also? Might be a charging or battery issue if that is the case.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33852
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Posted: 28 Aug 2018 at 8:49am |
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I can agree with the mouse nest aspect, pull the motor and see what lays inside the housing, could just be a corroded up motor but doubtful.
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Bill_MN
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Joined: 12 Sep 2009
Location: Sioux Falls, SD
Points: 1471
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Posted: 28 Aug 2018 at 6:03pm |
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I cleaned a mouse nest out of vents this spring and fixed inlet screen where they got in, fan and motor looked fine then. There is nothing to suggest another nest, no smell or strange sounds from fan area.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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LeonR2013
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Joined: 01 Jan 2013
Location: Fulton, Mo
Points: 3500
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Posted: 28 Aug 2018 at 6:24pm |
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check and see if the squirrel cage spins free.
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chaskaduo
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Joined: 26 Nov 2016
Location: Twin Cities
Points: 5200
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Posted: 29 Aug 2018 at 10:11am |
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The fan bearing or bearings could of gotten mouse pissed up.
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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Dakota Dave
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Joined: 12 Sep 2009
Location: ND
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Posted: 29 Aug 2018 at 1:49pm |
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I would be suprised if the running amperage is over 2 amps and shouldn't be noticeable. Run a hot wire direct from the battery and check the draw on it. You have load tested the battery first?
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Bill_MN
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Joined: 12 Sep 2009
Location: Sioux Falls, SD
Points: 1471
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Posted: 29 Aug 2018 at 8:10pm |
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Got my testing equipment here today, the battery and charging system tested fine, no mouse nests, the voltage drop with the fan on high was only about .2 volts so the volt gauge in the car was being a little over dramatic. The blower fan seemed to run a little faster today but still weak, so I'm thinking the fan itself just must be getting tired all of a sudden. At least no big troubles before the road trip.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 01 Sep 2018 at 8:59pm |
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If there was a mouse nest in the blower wheel, you'd know it. They will vibrate the dash big time. Probably the brushes are worn. If that's the case I've seen them melt the resistor and connectors. Get it fixed before you go on a long trip. The fuse will be 40 amps so there's plenty of current capability to melt things.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33852
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Posted: 02 Sep 2018 at 7:33am |
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If that Volt Meter is not ignored you may want to inspect the grounds to the body, I did have a bad Negative battery cable a few years back on a '91 ford Explorer that would increase the resistance to charging and the body/frame ground was not all that great where every drop in voltage would cause a increase in amp loads. The definer for me was hearing slight changes as to blower motor speed varying on its own, inside courtesy lights being a little dimmer at times, dash light flicker while driving and so on.
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