Home » Public Forums » GMCnet » Cut Wires
| Cut Wires [message #338193] |
Mon, 29 October 2018 05:19  |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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With the engine out for replacement I have come across several wires that have been intentionally cut in and around the engine compartment.
Coach has a homemade dash with VDO gauges, and no tell tail lights.
Yellow 16 ga wire from wireway that tucks up under front flooring of cockpit I am assuming goes to coolant level (tell tail) New Aluminum radiator that doesn't have sensor.
Brown 16ga wire for brake light found in original gauges.
Tan 16ga that goes to the transmission modulator.
Black 16a gauge wire that goes to alternator. Same wire that the APC would connect with. No APC installed!
I can understand why the brake wire and coolant wire would be cut, but why the modulator and alternator wires.
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Cut Wires [message #338196 is a reply to message #338193] |
Mon, 29 October 2018 07:09  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bruce,
Your guesses about the brake and coolant wires sound reasonable to me.
The modulator shouldn't have a wire to it, so that Tan wire is probably the
ORANGE wire for the downshift solenoid, which some folks disconnect to
disable the throttle kick-down.
There's no Black wire shown on the '78 wiring diagram -- the initial
excitation line, to pin 1 of the alternator, should be BROWN. It could
easily be mistaken for Black. But, if there's no connection to pin 1, it's
unlikely that a original alternator would produce voltage. Perhaps your
'78 is equipped with the optional 145A alternator, in which case the Red
and Brown wires should have been taped back to the harness. Or, someone
may have replaced the alternator with one not requiring initial excitation
(or, probably, remote voltage sensing -- not a good thing if you have an
isolator).
HTH,
Ken "Also Guessing" H.
On Mon, Oct 29, 2018 at 6:20 AM Bruce Hart wrote:
> With the engine out for replacement I have come across several wires that
> have been intentionally cut in and around the engine compartment.
> Coach has a homemade dash with VDO gauges, and no tell tail lights.
>
> Yellow 16 ga wire from wireway that tucks up under front flooring of
> cockpit I am assuming goes to coolant level (tell tail) New Aluminum
> radiator
> that doesn't have sensor.
>
> Brown 16ga wire for brake light found in original gauges.
>
> Tan 16ga that goes to the transmission modulator.
>
> Black 16a gauge wire that goes to alternator. Same wire that the APC would
> connect with. No APC installed!
>
>
> I can understand why the brake wire and coolant wire would be cut, but
> why the modulator and alternator wires.
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
>
> _______________________________________________
> 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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| Re: [GMCnet] Cut Wires [message #338197 is a reply to message #338196] |
Mon, 29 October 2018 07:33 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Thanks Ken, Your explanation helps out.
I will take a look at the alternator and see if it has any identification
of what you noted above.
On Mon, Oct 29, 2018 at 6:10 AM Ken Henderson
wrote:
> Bruce,
>
> Your guesses about the brake and coolant wires sound reasonable to me.
>
> The modulator shouldn't have a wire to it, so that Tan wire is probably the
> ORANGE wire for the downshift solenoid, which some folks disconnect to
> disable the throttle kick-down.
>
> There's no Black wire shown on the '78 wiring diagram -- the initial
> excitation line, to pin 1 of the alternator, should be BROWN. It could
> easily be mistaken for Black. But, if there's no connection to pin 1, it's
> unlikely that a original alternator would produce voltage. Perhaps your
> '78 is equipped with the optional 145A alternator, in which case the Red
> and Brown wires should have been taped back to the harness. Or, someone
> may have replaced the alternator with one not requiring initial excitation
> (or, probably, remote voltage sensing -- not a good thing if you have an
> isolator).
>
> HTH,
>
> Ken "Also Guessing" H.
>
>
>
>
>
> On Mon, Oct 29, 2018 at 6:20 AM Bruce Hart wrote:
>
>> With the engine out for replacement I have come across several wires that
>> have been intentionally cut in and around the engine compartment.
>> Coach has a homemade dash with VDO gauges, and no tell tail lights.
>>
>> Yellow 16 ga wire from wireway that tucks up under front flooring of
>> cockpit I am assuming goes to coolant level (tell tail) New Aluminum
>> radiator
>> that doesn't have sensor.
>>
>> Brown 16ga wire for brake light found in original gauges.
>>
>> Tan 16ga that goes to the transmission modulator.
>>
>> Black 16a gauge wire that goes to alternator. Same wire that the APC
> would
>> connect with. No APC installed!
>>
>>
>> I can understand why the brake wire and coolant wire would be cut, but
>> why the modulator and alternator wires.
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> Milliken, Co
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Cut Wires [message #338210 is a reply to message #338197] |
Tue, 30 October 2018 06:23 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
|
Senior Member |
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Ken, I could not find any markings on the alternator as to what amps or
version (145A).
It does have a fairly new isolator.
When the unit is up and running will have to take voltage readings.
On Mon, Oct 29, 2018 at 6:33 AM Bruce Hart wrote:
> Thanks Ken, Your explanation helps out.
> I will take a look at the alternator and see if it has any identification
> of what you noted above.
>
> On Mon, Oct 29, 2018 at 6:10 AM Ken Henderson
> wrote:
>
>> Bruce,
>>
>> Your guesses about the brake and coolant wires sound reasonable to me.
>>
>> The modulator shouldn't have a wire to it, so that Tan wire is probably
>> the
>> ORANGE wire for the downshift solenoid, which some folks disconnect to
>> disable the throttle kick-down.
>>
>> There's no Black wire shown on the '78 wiring diagram -- the initial
>> excitation line, to pin 1 of the alternator, should be BROWN. It could
>> easily be mistaken for Black. But, if there's no connection to pin 1,
>> it's
>> unlikely that a original alternator would produce voltage. Perhaps your
>> '78 is equipped with the optional 145A alternator, in which case the Red
>> and Brown wires should have been taped back to the harness. Or, someone
>> may have replaced the alternator with one not requiring initial excitation
>> (or, probably, remote voltage sensing -- not a good thing if you have an
>> isolator).
>>
>> HTH,
>>
>> Ken "Also Guessing" H.
>>
>>
>>
>>
>>
>> On Mon, Oct 29, 2018 at 6:20 AM Bruce Hart wrote:
>>
>>> With the engine out for replacement I have come across several wires
>> that
>>> have been intentionally cut in and around the engine compartment.
>>> Coach has a homemade dash with VDO gauges, and no tell tail lights.
>>>
>>> Yellow 16 ga wire from wireway that tucks up under front flooring of
>>> cockpit I am assuming goes to coolant level (tell tail) New Aluminum
>>> radiator
>>> that doesn't have sensor.
>>>
>>> Brown 16ga wire for brake light found in original gauges.
>>>
>>> Tan 16ga that goes to the transmission modulator.
>>>
>>> Black 16a gauge wire that goes to alternator. Same wire that the APC
>> would
>>> connect with. No APC installed!
>>>
>>>
>>> I can understand why the brake wire and coolant wire would be cut, but
>>> why the modulator and alternator wires.
>>> --
>>> Bruce Hart
>>> 1976 Palm Beach
>>> Milliken, Co
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
>
>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
_______________________________________________
GMCnet mailing list
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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