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Registered
Join Date: Oct 2015
Location: Iowa
Posts: 938
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How crazy is this? Fresh air blower turns on my glovebox light!
Scratching my head on this one. My friend Dennis Powell is helping me troubleshoot, but I wanted to post in case someone in the future has the same problem.
Here's a video. https://photos.app.goo.gl/hNAgqYXxZRHtMqWd9 Any thoughts? |
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04-12-2022, 05:30 PM
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Registered
Join Date: Dec 2015
Location: Dallas, Texas
Posts: 698
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Just a general thought - In my 83, and a lot of other years, the little fan logo in the corner of the blower controls doesn’t light unless the fan is turned on via the fan speed lever. There are lights in the other three corners of the panel that stay lit at all times with the headlights.
No idea how someone could have butchered your lights this badly since blower logo light should be ran through headlight switch and presumably glovebox light is not, but maybe they now share a ground? |
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04-13-2022, 03:08 AM
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Registered
Join Date: Aug 2007
Location: San Antonio, TX
Posts: 2,177
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The wiring to the glove box light is in the "harness" that runs the fan on the back of the vent assy. Pretty easy to see wiring with the radio pulled. My guess is a ground gone bad or altered by a stereo butcher that got a hold of the harness at some point.
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04-13-2022, 03:48 AM
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Going from memory here but I think the glovebox light has 3 positions (OFF/AUTO/ON) and the ground portion of the switch is on the low/switched side.
It's a funny little circuit and to make it worse the +12V power wire is black which probably causes most mechanics (and yes indeed stereo butchers) no end of trouble. Because you never, ever, ever, switch the neutral on 120VAC house wiring that also becomes ingrained in many DIY psyches and the assumption becomes the switching is always done on the high (12V) side. So possibly someone switched the wires on the glovebox light and it's causing interesting things to happen.
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 Last edited by Jonny042; 04-13-2022 at 03:59 AM.. |
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04-13-2022, 03:56 AM
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Easily Confused
Join Date: Feb 2005
Location: Republic of Texas
Posts: 431
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Most likely the fan is achieving a path to ground via the glovebox light. I wouldn't run the fan until this is sorted out as the fan could pull too much current through the lamp circuit and cause problems.
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Scott C. '08 Cayenne GTS 6MT : '89 Targa GP White/Black - "Oliver's Car" : '11 Mitsu Evo X : '08 Lexus IS350 F-Sport : '01 Toyota Sequoia : 1998 Yamaha V-max : 1979 BMW R65 |
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04-13-2022, 11:13 AM
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ROW '78 911 Targa
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Solution found.
Mis-wired 6 pin plug. They changed some pin allocations over the years and the wrong configuration was used for repairs to that circuit on the car.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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04-13-2022, 06:10 PM
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Registered
Join Date: Oct 2015
Location: Iowa
Posts: 938
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Thanks Dennis for helping me figure this one out. Your help is always there and appreciated.
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1983 SC Coupe Chiffon White 3.0 rebuilt by me 9.5:1 964 Cams. SSI's. Backdated heat. KEP sports clutch. |
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04-15-2022, 03:39 AM
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Heinz
