blower motor/AC/heat

The ground wire from the harness has to be firmly attached to the motor housing to complete the ground path for the motor, which is internally
grounded to the motor housing (unless it's an aftermarket blower motor that has a separate ground wire).
--
Terry Kelpien

ASE Master Technician

73 Glacier 260

Smithfield, Va.
 
If you suspect that that capacitor is bad, you can just eliminate it. It's purpose is to reduce or eliminate the fan motor noise in the radio. If
you do later notice fan noise in the radio then replace it. Most of those noise suppression capacitors are shot after 40 years.

It sounds like you found the ground wire that is connected to the fan motor and fixed your problem. If you have a star or tooth washer handy, install
it between the wire lug and the motor frame. Then re-tighten the screw through the motor frame and into the fiber glass. Be careful not to strip the
screw hole out in the fiberglass.

The connection that you found loose or corroded is a common failure on Gm vehicles of this era.

Good luck. It sounds like you are making good progress on the wiring issues on this coach.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
> ...It's ALWAYS the ground. ...
Only when you can't find anything else. You might say it is always CONNECTIONS. A lot of times there is corrosion in the space connectors. Sorry I
didn't think of that and mention it. As a communications guy, I didn't work on much stuff that was 40 years old and exposed to the elements. The first
assumption we always started with was "if it had been working, it is not the wiring infrastructure." That made us look at active components (like the
fan motor and relays).

Not true in automotive stuff that vibrates going down the road and has wide swings of temperature and humidity. Seems a lot of the time it is
connectors.

The Oldsmobile diesel Cutlass had a connector in the glow plug circuit that was installed to catch dirt. If the assemblers had flipped it over in the
wiring harness, I might never have had to figure it out, disconnect it, clean the dirt out of it, and polish the contacts, to get the glow plugs
working again.
--
73 23' Sequoia 4 Sale
73 23' CanyonLands Parts Unit 4 Sale
Upper Alabama
"Highest price does not guarantee highest quality."
 
When I attended General Motors training school, one of the first things
they taught us about automotive circuits was "90% of all electrical
problems are conductor related, either wires or connectors". Been true for
me for 40 years or more.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

> > ...It's ALWAYS the ground. ...
> Only when you can't find anything else. You might say it is always
> CONNECTIONS. A lot of times there is corrosion in the space connectors.
> Sorry I
> didn't think of that and mention it. As a communications guy, I didn't
> work on much stuff that was 40 years old and exposed to the elements. The
> first
> assumption we always started with was "if it had been working, it is not
> the wiring infrastructure." That made us look at active components (like the
> fan motor and relays).
>
> Not true in automotive stuff that vibrates going down the road and has
> wide swings of temperature and humidity. Seems a lot of the time it is
> connectors.
>
> The Oldsmobile diesel Cutlass had a connector in the glow plug circuit
> that was installed to catch dirt. If the assemblers had flipped it over in
> the
> wiring harness, I might never have had to figure it out, disconnect it,
> clean the dirt out of it, and polish the contacts, to get the glow plugs
> working again.
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Highest price does not guarantee highest quality."
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Do not forget the apc cable

> When I attended General Motors training school, one of the first things
> they taught us about automotive circuits was "90% of all electrical
> problems are conductor related, either wires or connectors". Been true for
> me for 40 years or more.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>

>

> > > ...It's ALWAYS the ground. ...
> > Only when you can't find anything else. You might say it is always
> > CONNECTIONS. A lot of times there is corrosion in the space connectors.
> > Sorry I
> > didn't think of that and mention it. As a communications guy, I didn't
> > work on much stuff that was 40 years old and exposed to the elements. The
> > first
> > assumption we always started with was "if it had been working, it is not
> > the wiring infrastructure." That made us look at active components (like
> the
> > fan motor and relays).
> >
> > Not true in automotive stuff that vibrates going down the road and has
> > wide swings of temperature and humidity. Seems a lot of the time it is
> > connectors.
> >
> > The Oldsmobile diesel Cutlass had a connector in the glow plug circuit
> > that was installed to catch dirt. If the assemblers had flipped it over
> in
> > the
> > wiring harness, I might never have had to figure it out, disconnect it,
> > clean the dirt out of it, and polish the contacts, to get the glow plugs
> > working again.
> > --
> > 73 23' Sequoia 4 Sale
> > 73 23' CanyonLands Parts Unit 4 Sale
> > Upper Alabama
> > "Highest price does not guarantee highest quality."
> >
> > _______________________________________________
> > 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
>
 
> I don't understand how anybody is successful in grounding anything to fiberglass.

Terry,

That is why boat people only buy 2 conductor.
I have run a return for everything that I have put in and a few others that were there already.

Matt

--
Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
'73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
Now with both true Keyless and remote entry
SE Michigan - Twixt A2 and Detroit
 
If the fiberglass the screw is threading into is loose, you could drill a 1/8" hole in the fan's metal mounting flange close to the existing ground
point. Then move the existing ground wire to this new hole using a #8 screw with a star washer and some anti-oxidant grease. The screw will then be
fastened directly into the metal fan housing. That should last a lifetime.
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
Hubler 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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GMCMI Fall 2026 Rally

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