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| Gauge Cluster Repair [message #234057] |
Thu, 26 December 2013 19:50  |
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Richard Andis
Messages: 261
Registered: January 2013
Location: HELL Paso, TX
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While transplanting the circuit board on the back of the gauge cluster I neglected to document a few things.
First thing I discovered were that the ballast resistors for the gauges were color coded. There was a green, blue, and a red one (marked on the back). Anybody know which resistor goes to which gauge?
Via search, I've discovered Water Temp uses a red one.
Valhalla - 1978 GMC Royale rear twin [SOLD]
Walküre - 1974 VW Thing (Toad)
[Updated on: Thu, 26 December 2013 19:58] Report message to a moderator |
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| Re: Gauge Cluster Repair [message #234072 is a reply to message #234057] |
Thu, 26 December 2013 21:19  |
KevinZ
Messages: 20
Registered: November 2013
Location: Oswego NY
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We have a shop that rebuilds automotive dash assemblies in our area, I'll check with them tomorrow.
KZ
Oswego, NY
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| Re: Gauge Cluster Repair [message #234202 is a reply to message #234072] |
Fri, 27 December 2013 21:19 |
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Richard Andis
Messages: 261
Registered: January 2013
Location: HELL Paso, TX
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Senior Member |
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Seeing how I doubt anybody has a AC-GG3 tester,....Is there any good way to bench test an individual gauge on the cluster.
Looks to me that if you connect GROUND from a 12VDC power source to the gauge body and POSITIVE to PIN F of the connector, that should cause all of the gauge needles to MAX out since no senders are connected.
Additionally, using the mentioned set-up, you should then be able to connect a 0-90 ohm variable resistor to the appropriate pin below and get an corresponding needle movement based on the value of the resistor.
C - Fuel
D - Oil Pressure
H - Engine Temp
Valhalla - 1978 GMC Royale rear twin [SOLD]
Walküre - 1974 VW Thing (Toad)
[Updated on: Fri, 27 December 2013 21:20] Report message to a moderator |
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| Re: Gauge Cluster Repair [message #234509 is a reply to message #234501] |
Mon, 30 December 2013 20:38 |
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Richard Andis
Messages: 261
Registered: January 2013
Location: HELL Paso, TX
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| A Hamilto wrote on Mon, 30 December 2013 19:50 |
Someplace on this forum I read that if you replace the stock sending unit with a Napa TS-6469, the stock gauge will read higher. I understand that with the stock setup, when the gauge reads halfway, the coolant is around 250 degrees F. In other words, already overheated. With the Napa replacement sender, halfway is around 200F.
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I'm using a spare VDO fuel gauge at a test instrument. It operates in the 10-90 ohm range. When I do the quick test then needle goes to full range (open) or zero (grounded) as expected.
The problem is that my OEM gauge needle is only to going half way when you ground the sensor wire. I believe it should peg it to full. I'm starting to believe that one of the windings may be bad.
No Resistance (grounded) = Full Swing
Infinite Resistance (open or disconnected) = 0 Swing.
This should happen irrespective of sensor values. This little "test" should work on most electrical fuel, oil, and water temp gauges. Don't even have to start the engine. Just set the key to ACC.
I found this link with regard to the resistor color codes on back
of the gauges. Might be useful
http://www.europeancorvette.com/html/console_gauges.htm
Valhalla - 1978 GMC Royale rear twin [SOLD]
Walküre - 1974 VW Thing (Toad)
[Updated on: Mon, 30 December 2013 21:27] Report message to a moderator |
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| Re: [GMCnet] Gauge Cluster Repair [message #234534 is a reply to message #234509] |
Tue, 31 December 2013 00:39 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Richard,
You should find that only the fuel gauge and perhaps the LPG sender are 90
Ohms. I don't recall the range on the oil pressure or temperature senders,
but they're much higher. I periodically set up test apparatus and
calibrate a few. In fact, I've got about 6 temperature senders on the
bench with the apparatus right now.
Hah! Just remembered that I posted photos of a calibration session some
years ago. Maybe this will help:
http://www.gmcmhphotos.com/photos/g3443-temperature-gauges-calibration.html
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL
www.gmcwipersetc.com
On Mon, Dec 30, 2013 at 9:38 PM, Richard Andis <randis2@elp.rr.com> wrote:
>
>
> A Hamilto wrote on Mon, 30 December 2013 19:50
> > Someplace on this forum I read that if you replace the stock sending
> unit with a Napa TS-6469, the stock gauge will read higher. I understand
> that with the stock setup, when the gauge reads halfway, the coolant is
> around 250 degrees F. In other words, already overheated. With the Napa
> replacement sender, halfway is around 200F.
>
>
> I'm using a spare VDO fuel gauge at a test instrument. It operates in the
> 10-90 ohm range. When I do the quick test then needle goes to full range
> (open) or zero (grounded) as expected.
>
> The problem is that my OEM gauge needle is only to going half way when you
> ground the sensor wire. I believe it should peg it to full. I'm starting to
> believe that one of the windings may be bad.
>
> No Resistance (grounded) = Full Swing
> Infinite Resistance (open or disconnected) = 0 Swing.
>
> This should happen irrespective of sensor values. This little "test"
> should work on most electrical fuel, oil, and water temp gauges. Don't even
> have to start the engine. Just set the key to ACC.
>
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Gauge Cluster Repair [message #234558 is a reply to message #234534] |
Tue, 31 December 2013 08:52 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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and this is what i had
http://gmcmotorhome.info/engine.html#sender
gene
On Mon, Dec 30, 2013 at 10:39 PM, Ken Henderson <hend4800@bellsouth.net>wrote:
> Richard,
>
> You should find that only the fuel gauge and perhaps the LPG sender are 90
> Ohms. I don't recall the range on the oil pressure or temperature senders,
> but they're much higher. I periodically set up test apparatus and
> calibrate a few. In fact, I've got about 6 temperature senders on the
> bench with the apparatus right now.
>
> Hah! Just remembered that I posted photos of a calibration session some
> years ago. Maybe this will help:
>
> http://www.gmcmhphotos.com/photos/g3443-temperature-gauges-calibration.html
>
>
> Ken H.
> Americus, GA
> '76 X-Birchaven w/Cad500/Howell EFI & EBL
> www.gmcwipersetc.com
>
>
> On Mon, Dec 30, 2013 at 9:38 PM, Richard Andis <randis2@elp.rr.com> wrote:
>
> >
> >
> > A Hamilto wrote on Mon, 30 December 2013 19:50
> > > Someplace on this forum I read that if you replace the stock sending
> > unit with a Napa TS-6469, the stock gauge will read higher. I understand
> > that with the stock setup, when the gauge reads halfway, the coolant is
> > around 250 degrees F. In other words, already overheated. With the Napa
> > replacement sender, halfway is around 200F.
> >
> >
> > I'm using a spare VDO fuel gauge at a test instrument. It operates in the
> > 10-90 ohm range. When I do the quick test then needle goes to full range
> > (open) or zero (grounded) as expected.
> >
> > The problem is that my OEM gauge needle is only to going half way when
> you
> > ground the sensor wire. I believe it should peg it to full. I'm starting
> to
> > believe that one of the windings may be bad.
> >
> > No Resistance (grounded) = Full Swing
> > Infinite Resistance (open or disconnected) = 0 Swing.
> >
> > This should happen irrespective of sensor values. This little "test"
> > should work on most electrical fuel, oil, and water temp gauges. Don't
> even
> > have to start the engine. Just set the key to ACC.
> >
> >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Gauge Cluster Repair [message #234755 is a reply to message #234501] |
Wed, 01 January 2014 19:11 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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I bought the Napa TS-6469 sending unit and it read the same as the OEM unit.
On Mon, Dec 30, 2013 at 6:50 PM, A. <markbb1@netzero.com> wrote:
>
>
> Richard Andis wrote on Mon, 30 December 2013 18:10
> > Still working this problem out. I think I got just about everything
> working again but the Water Temp Gauge. When I disconnect the wire at the
> temp sensor it zeros out on the gauge and when I ground the wire the needle
> only moves half way up the scale.
> >
> > I took a reading of the sensor with the engine running and read 195 ohms
> (sensor terminal to ground). It continued to climb to about 200 ohms and
> them level out. Anybody know the range of the temp sensor (in ohms)?
> Someplace on this forum I read that if you replace the stock sending unit
> with a Napa TS-6469, the stock gauge will read higher. I understand that
> with the stock setup, when the gauge reads halfway, the coolant is around
> 250 degrees F. In other words, already overheated. With the Napa
> replacement sender, halfway is around 200F.
> --
> '73 23' Sequoia For Sale
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> CanyonLands most likely for a parts coach. Sequoia being restored to
> service.
> _______________________________________________
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
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1977 28' Kingsley
La Grange, Wyoming
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