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[GMCnet] Unplugged wire connector under dash. [message #342970]

Tue, 30 April 2019 12:07

Tangerine

Messages: 192
Registered: February 2004
Location: Livonia, MI

Karma: 0

Senior Member

I have a problem, when I start the engine, I have to keep the key in the
start position or the engine will shut off.

I found a wire connector plug under the dash that is unplugged. I don't
know where it goes. Could it be the cause of my problem?

http://www.gmcmhphotos.com/photos/electrical/p66342-unpluged-wire-connector-under-dash.html

--
Gary W. Mills
Livonia, MI
. ___________
./_][__][] []| 1974 GMC M/H
.*O-------OO-* Painted Desert

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1974 GMC 260
Tangerine Dream
Livonia Michigan

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Re: [GMCnet] Unplugged wire connector under dash. [message #342975 is a reply to message #342970]

Tue, 30 April 2019 12:50

Emery Stora

Messages: 959
Registered: January 2011

Karma: 4

Senior Member

There is a linear switch down at the bottom of your steering column above the pedals that is controlled by a rod from the ignition switch. I believe that it has a couple of plugs that go into it that look similar to your picture.
Look in that area to see if it is missing a plug.

Otherwise it may just be out of adjustment. You can loosen a screw and slide it up and down to get the contacts to work properly. There should be a picture of it in the parts 78Z book. Look in the steering shaft section. I don’t have the book with me right now so I cannot give you a page number.

Emery Stora

> On Apr 30, 2019, at 11:07 AM, Gary Mills via Gmclist wrote:
>
> I have a problem, when I start the engine, I have to keep the key in the start position or the engine will shut off.
>
> I found a wire connector plug under the dash that is unplugged. I don't know where it goes. Could it be the cause of my problem?
>
> http://www.gmcmhphotos.com/photos/electrical/p66342-unpluged-wire-connector-under-dash.html
>
> --
> Gary W. Mills
> Livonia, MI
> . ___________
> ./_][__][] []| 1974 GMC M/H
> .*O-------OO-* Painted Desert
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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Re: [GMCnet] Unplugged wire connector under dash. [message #342977 is a reply to message #342970]

Tue, 30 April 2019 13:13

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Tangerine wrote on Tue, 30 April 2019 13:07

I have a problem, when I start the engine, I have to keep the key in the start position or the engine will shut off.

I found a wire connector plug under the dash that is unplugged. I don't know where it goes. Could it be the cause of my problem?
<snip>
Gary W. Mills

Gary,

I think that connector goes into the instrument panel.
I also agree with Emery that the problem is most likely with the switch that is down on the column. It could either be out of adjustment or failed. Adjustment is easy. Replacement is a PITA because I don't bend the way needed to get at the screws.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] Unplugged wire connector under dash. [message #342979 is a reply to message #342970]

Tue, 30 April 2019 13:25

RF_Burns

Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

I'm thinking its a speaker connector for the OEM radio, likely rear speakers?...

But its been 40 years since I worked on that stuff, so I maybe WRONG!

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: [GMCnet] Unplugged wire connector under dash. [message #342988 is a reply to message #342970]

Tue, 30 April 2019 14:25

RF_Burns

Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

Gary, Sorry I read your photo site posting first, now I see you are having issues with power to the ignition coil.

I looked at my spare ignition switch and it uses 1/4" tab connections. I believe'74s still used the points ignition, Is your coach still running points? If so power to the coil is provided from a terminal on the starter solenoid during start, and then through a resistance wire when in run, so two different circuits.

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Re: [GMCnet] Unplugged wire connector under dash. [message #343016 is a reply to message #342988]

Wed, 01 May 2019 07:35

Tangerine

Messages: 192
Registered: February 2004
Location: Livonia, MI

Karma: 0

Senior Member

On 4/30/2019 3:25 PM, Bruce Hislop via Gmclist wrote:
> Gary, Sorry I read your photo site posting first, now I see you are having issues with power to the ignition coil.
>
> I looked at my spare ignition switch and it uses 1/4" tab connections. I believe'74s still used the points ignition, Is your coach still running
> points? If so power to the coil is provided from a terminal on the starter solenoid during start, and then through a resistance wire when in run, so
> two different circuits.

Bruce; I do not have the points. But Dick Paterson redid my distributor
with petronics. Where would I find the resistor wire? It will stay
running in the start position. Shuts off when released.

--
Gary W. Mills
Livonia, MI
. ___________
./_][__][] []| 1974 GMC M/H
.*O-------OO-* Painted Desert

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1974 GMC 260
Tangerine Dream
Livonia Michigan

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Re: [GMCnet] Unplugged wire connector under dash. [message #343017 is a reply to message #342979]

Wed, 01 May 2019 07:30

Tangerine

Messages: 192
Registered: February 2004
Location: Livonia, MI

Karma: 0

Senior Member

On 4/30/2019 2:25 PM, Bruce Hislop via Gmclist wrote:
> I'm thinking its a speaker connector for the OEM radio, likely rear speakers?...
>
> But its been 40 years since I worked on that stuff, so I maybe WRONG!

THX Bruce, but it is too short to reach the radio.

--
Gary W. Mills
Livonia, MI
. ___________
./_][__][] []| 1974 GMC M/H
.*O-------OO-* Painted Desert

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1974 GMC 260
Tangerine Dream
Livonia Michigan

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Re: [GMCnet] Unplugged wire connector under dash. [message #343019 is a reply to message #342970]

Wed, 01 May 2019 07:53

RF_Burns

Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

Gary,
Go here and download the chassis wiring diagram for your model year of coach.

http://www.bdub.net/wirediagrams/

The ignition switch is near the top of the diagram. I'm guessing that with the Pertronics module, it still uses the resistor wire. On the '73 diagram it shows Ignition goes from a #12 Pink to a #18 black wire which then changes to the resistance wire being #20 Black with pink. The resistance of the wire is shown as 1.35 ohms. The wires will be buried in the wiring harness, so good luck at finding it. If you have voltage at the switch, but nothing at the coil (open connection through the wire) it would likely be easier to just pull a new wire with a resistor in-line.

As mentioned by others it could be the physical adjustment of the switch, or the switch itself.

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Re: [GMCnet] Unplugged wire connector under dash. [message #343031 is a reply to message #343019]

Wed, 01 May 2019 11:36

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

I strongly suspect that DIck Paterson recommends bypassing the resistance
wire. Whether he does or not, that's certainly what I'd do. The Pertronix
1181 (with Hall effect sensor and magnets for Olds/GMC) definitely expects
to operate at 12 VDC. I'm sure the distributor lobe detecting equivalent,
which Dick may use, also expects 12 VDC.

Ken H.

On Wed, May 1, 2019 at 9:22 AM Bruce Hislop via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Gary,
> Go here and download the chassis wiring diagram for your model year of
> coach.
>
> http://www.bdub.net/wirediagrams/
>
> The ignition switch is near the top of the diagram. I'm guessing that
> with the Pertronics module, it still uses the resistor wire. On the '73
> diagram
> it shows Ignition goes from a #12 Pink to a #18 black wire which then
> changes to the resistance wire being #20 Black with pink. The resistance of
> the
> wire is shown as 1.35 ohms. The wires will be buried in the wiring
> harness, so good luck at finding it. If you have voltage at the switch, but
> nothing at the coil (open connection through the wire) it would likely be
> easier to just pull a new wire with a resistor in-line.
>
> As mentioned by others it could be the physical adjustment of the switch,
> or the switch itself.
>
>
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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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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