Mystery Glovebox Switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wendell173 · 12-23-2009, 12:00 PM

There is a three way toggle switch inside my glovebox. See images below. The 3 settings are On, Shock Off, and Off. I have always wondered what it does since I bought my truck. Any ideas?

cdowns · 12-23-2009, 12:23 PM

only suggestion i have is to follow the wires and see what it's hooked up to

cjaj70 · 12-23-2009, 12:31 PM

I would guess it goes to an alarm.

oldblue1968chevy · 12-23-2009, 12:40 PM

it isnt factory lol

what happens when ya press it lol are ya scared??!?!

killer71 · 12-23-2009, 12:41 PM

you have my permission to move the switch and find out!

wendell173 · 12-23-2009, 01:13 PM

My next step was to follow it to see where it goes. I just thought I would see if anyone knew. It does not seem to do anything when I press it. Thanks, Gang!

Hottrucks · 12-23-2009, 01:20 PM

Quote:

Originally Posted by killer71

you have my permission to move the switch and find out!

Pleeeeeeeaaassseee!! set up a camera to vid this...I havn't had a good laugh in a long time...

62ramptruck · 12-23-2009, 01:48 PM

I would say this was a switch for an alarm that had a shock sensor. Just my .02

**John Fabris** · 12-23-2009, 02:08 PM

Is it for the am radio?

"A switch-off shock muting circuit for use in an AM receiver comprising a muting element disposed in a signal transmission path extending from the antenna through the demodulation and low frequency amplifying sections to the speaker of the receiver, a power switch and control switching means interlocked with the power switch, the control switching means being operated at an earlier time than the turning off of the power switch to thereby control the muting element, whereby spark noise caused by the power switch is prevented by controlling the muting element from the control switching means to thereby interrupt the signal transmission line earlier than the turning off of the power switch. "

54blackhornet · 12-23-2009, 02:12 PM

That was the most confusing reply I have ever read !!!!!!!!

1970 chev truck · 12-23-2009, 02:14 PM

x2!!

**John Fabris** · 12-23-2009, 02:37 PM

yea, I was hoping that a geek would jump in and explain that in truck layman terms...

Mowdigger · 12-23-2009, 03:34 PM

Who,What, When, Where ????? Huh

**Stocker** · 12-23-2009, 03:53 PM

Quote:

Originally Posted by 62ramptruck

I would say this was a switch for an alarm that had a shock sensor. Just my .02

The more I think about it, this is probably right.

BAGNDRAGIT · 12-23-2009, 05:07 PM

Quote:

Originally Posted by john fabris

is it for the am radio?

"a switch-off shock muting circuit for use in an am receiver comprising a muting element disposed in a signal transmission path extending from the antenna through the demodulation and low frequency amplifying sections to the speaker of the receiver, a power switch and control switching means interlocked with the power switch, the control switching means being operated at an earlier time than the turning off of the power switch to thereby control the muting element, whereby spark noise caused by the power switch is prevented by controlling the muting element from the control switching means to thereby interrupt the signal transmission line earlier than the turning off of the power switch. "

what!?!?!?!

**John Fabris** · 12-23-2009, 05:12 PM

I doubt this has anything to do with an alarm. The glovebox is one of the first places a thief would look, right?

BarryB · 12-23-2009, 05:14 PM

The shock part reminds me off an old timer here locally, He had a coil somehow wired up to his cars body. When somebody would come along and lean on his car they would get a pretty good jolt. He had it switched inside the car under the dash, it was funny as heck to watch when he would be sitting in the car somebody come over to talk at him, and he would hit the switch "ZAP".

Bentblazer · 12-23-2009, 05:16 PM

It's the switch to the spark plug under the pass side seat to shock the sh*t out of the person sitting there, was fun in the 70's

68gmsee · 12-23-2009, 05:30 PM

Here's the diagram for the circuit. I'm surpised y'all didn't know what it was for...

Sport/Truck · 12-23-2009, 05:38 PM

Quote:

Originally Posted by 68gmsee

Here's the diagram for the circuit. I'm surpised y'all didn't know what it was for...

yep, its a flux capacitor.

s/t

Hottrucks · 12-23-2009, 05:55 PM

when I was a kid I had one of those in my Vega ??? never did figure out what it was for

68gmsee · 12-23-2009, 07:33 PM

From my understanding, these switches are used in amplifier circuitry to prevent feedback voltage during on/off switching. The switch redirects the current to the circuitry designed to prevent this type of feedback noise.

**Stocker** · 12-23-2009, 10:59 PM

I think cdowns had the best idea so far...

**special-K** · 12-23-2009, 11:00 PM

Since it`s not factory and it`s only on your truck I think it`s up to you to teach us something.

Quote:

Originally Posted by John Fabris

Is it for the am radio?

"A switch-off shock muting circuit for use in an AM receiver comprising a muting element disposed in a signal transmission path extending from the antenna through the demodulation and low frequency amplifying sections to the speaker of the receiver, a power switch and control switching means interlocked with the power switch, the control switching means being operated at an earlier time than the turning off of the power switch to thereby control the muting element, whereby spark noise caused by the power switch is prevented by controlling the muting element from the control switching means to thereby interrupt the signal transmission line earlier than the turning off of the power switch. "

Sounds good to me.I`m no electrical engineer,so I`m not familiar with all the terms used.But,that doesn`t make this explanation wrong.Somehow I somewhat followed that and I recall the "thump" from AM radios back in the days.I understand this is a way to cut power to the speaker until the radio is powered up.Before stereos there were many enhancements used on AM radios.A reverb switch is the one I recall.

stueber68 · 12-23-2009, 11:18 PM

okay this one gets the vote for funny thread of 09

12-23-2009, 12:00 PM	#1
wendell173 Registered User Join Date: Dec 2009 Location: OKC, OK Posts: 5	Mystery Glovebox Switch There is a three way toggle switch inside my glovebox. See images below. The 3 settings are On, Shock Off, and Off. I have always wondered what it does since I bought my truck. Any ideas? __________________ 1971 GMC Sierra Grande

12-23-2009, 12:23 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Mystery Glovebox Switch only suggestion i have is to follow the wires and see what it's hooked up to __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-23-2009, 12:31 PM	#3
cjaj70 Registered User Join Date: Sep 2009 Location: Perry, OK Posts: 27	Re: Mystery Glovebox Switch I would guess it goes to an alarm.

12-23-2009, 12:40 PM	#4
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Mystery Glovebox Switch it isnt factory lol what happens when ya press it lol are ya scared??!?! __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

12-23-2009, 12:41 PM	#5
killer71 Registered User Join Date: May 2006 Location: at work Posts: 2,552	Re: Mystery Glovebox Switch you have my permission to move the switch and find out! __________________ R.I.P. Killer 71 10/26/07

12-23-2009, 01:13 PM	#6
wendell173 Registered User Join Date: Dec 2009 Location: OKC, OK Posts: 5	Re: Mystery Glovebox Switch My next step was to follow it to see where it goes. I just thought I would see if anyone knew. It does not seem to do anything when I press it. Thanks, Gang! __________________ 1971 GMC Sierra Grande

12-23-2009, 01:48 PM	#8
62ramptruck Registered User Join Date: Jun 2005 Location: Kentucky Posts: 69	Re: Mystery Glovebox Switch I would say this was a switch for an alarm that had a shock sensor. Just my .02 __________________ 1968 C10 SWB "Project Shop Truck" 1964 Impala 2DR Hydraulics 1933 Ford 2DR Sedan 1965 AC Cobra (Long Term Project) 1998 Viper GTS-R 1962 Chevy RampTruck (SOLD)

12-23-2009, 02:08 PM	#9
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Mystery Glovebox Switch Is it for the am radio? "A switch-off shock muting circuit for use in an AM receiver comprising a muting element disposed in a signal transmission path extending from the antenna through the demodulation and low frequency amplifying sections to the speaker of the receiver, a power switch and control switching means interlocked with the power switch, the control switching means being operated at an earlier time than the turning off of the power switch to thereby control the muting element, whereby spark noise caused by the power switch is prevented by controlling the muting element from the control switching means to thereby interrupt the signal transmission line earlier than the turning off of the power switch. " __________________ John Fabris 67 C10 SWB Last edited by John Fabris; 12-23-2009 at 02:10 PM.

12-23-2009, 02:12 PM	#10
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,406	Re: Mystery Glovebox Switch That was the most confusing reply I have ever read !!!!!!!!

12-23-2009, 02:14 PM	#11
1970 chev truck Weldin' it up Join Date: Mar 2007 Location: Ironwood, Michigan Posts: 803	Re: Mystery Glovebox Switch x2!! __________________ -Paul- RIP El Jay Dirt is for Racing, Asphalt is for Getting There If need be, send me an e-mail at cbm_racing_90@hotmail.com 1970 Custom/10 LWB 4X4 350/TH350 2003 Silverado 1500 Ext. cab 1974 Kawasaki 175 F7 Enduro 2002 Polaris Edge X 700

12-23-2009, 02:37 PM	#12
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Mystery Glovebox Switch yea, I was hoping that a geek would jump in and explain that in truck layman terms... __________________ John Fabris 67 C10 SWB

12-23-2009, 03:34 PM	#13
Mowdigger Registered User Join Date: Jan 2008 Location: Mt. Auburn, Il Posts: 127	Re: Mystery Glovebox Switch Who,What, When, Where ????? Huh

12-23-2009, 05:12 PM	#16
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Mystery Glovebox Switch I doubt this has anything to do with an alarm. The glovebox is one of the first places a thief would look, right? __________________ John Fabris 67 C10 SWB

12-23-2009, 05:14 PM	#17
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: Mystery Glovebox Switch The shock part reminds me off an old timer here locally, He had a coil somehow wired up to his cars body. When somebody would come along and lean on his car they would get a pretty good jolt. He had it switched inside the car under the dash, it was funny as heck to watch when he would be sitting in the car somebody come over to talk at him, and he would hit the switch "ZAP". __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff! Last edited by BarryB; 12-23-2009 at 05:15 PM.

12-23-2009, 05:16 PM	#18
Bentblazer Registered User Join Date: Sep 2007 Location: Rolla Mo. Posts: 667	Re: Mystery Glovebox Switch It's the switch to the spark plug under the pass side seat to shock the sh*t out of the person sitting there, was fun in the 70's __________________ "85" Monte Carlo SS "71" K5 (SOLD) "64" Chevelle 1930 Chevy two door rat



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12-23-2009, 05:30 PM	#19
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Mystery Glovebox Switch Here's the diagram for the circuit. I'm surpised y'all didn't know what it was for...

12-23-2009, 05:55 PM	#21
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Mystery Glovebox Switch when I was a kid I had one of those in my Vega ??? never did figure out what it was for __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

12-23-2009, 07:33 PM	#22
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Mystery Glovebox Switch From my understanding, these switches are used in amplifier circuitry to prevent feedback voltage during on/off switching. The switch redirects the current to the circuitry designed to prevent this type of feedback noise.

12-23-2009, 10:59 PM	#23
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,763	Re: Mystery Glovebox Switch I think cdowns had the best idea so far... __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

12-23-2009, 11:18 PM	#25
stueber68 1968 C20 Vortec Beast Join Date: Jun 2005 Location: STILLWATER,OKLAHOMA Posts: 483	Re: Mystery Glovebox Switch okay this one gets the vote for funny thread of 09 __________________ Ugly or not it still kicks a**!

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