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| Re: May have solved mystery device..... [message #157011 is a reply to message #157008] |
Mon, 16 January 2012 23:15   |
glacierfl
Messages: 444
Registered: June 2011
Karma: 0
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Helllo,
"How did you figure out it was a knock sensor?"
Well a few clues. The microphone on the black lead was the first clue. It has adjustments also, and drives 2 leds, one in the device itself, and one on the dash. So i had a circuit board, with an audio input, and variable sensitivity, that drives 2 red leds. So well the only thing that made any sense, was a knock sensor....
If i had an oscilloscope that would help me out, but i do not.
So well, my money is currently on the knock sensor.
It's still connected in the dash, too much going on to rebuild etc, at the moment to mess with it.If i take it out some time, i can do a few tests on it.
cheers and beers
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
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| Re: [GMCnet] May have solved mystery device..... [message #157072 is a reply to message #156892] |
Tue, 17 January 2012 13:40 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On Jan 15, 2012, at 11:48 PM, steve & debbie wrote:
>
>
> Hello, some of you may remember i posted this some time ago.
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=41522&title=mystery-device-found-in-dash-&cat=5949
>
> I think its a Knock Detector.
>
> cheers and beers
> --
> Steve & Debbie
>
Your 1977 has three small modules (circuit boards) behind the dash.
There is a low coolant module. It should have 4 wires. Light Blue, Yellow, Brown with dbl white stripe, black.
There is an Electro Level time delay relay that lights a panel light reminding you to put the switch into travel.
It has three wires. Brown with dbl white stripe, yellow and brown.
There is a Low Fuel module that tells you when you are getting low.
It has 4 wires. White, Black, Pink with dbl black stripe and Light Green.
Check the wires on the module that you are questioning and let us know.
I really doubt that you have a knock sensor module as GM did not install those and that would not be a place where a prior owner would install one.
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] May have solved mystery device..... [message #157139 is a reply to message #157072] |
Tue, 17 January 2012 22:25 |
glacierfl
Messages: 444
Registered: June 2011
Karma: 0
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Senior Member |
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Hello,
Emery look at the photo i posted, this is not an OEM device. If you have any ideas on that it is then please tell me what you think. It has audio input, and sensitivity adjustment.
Only thing that makes any sense to me is a knock sensor ????
Thanks for the info on the OEM circuit boards fitted, that info is going to come in handy 
cheers and beers
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
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