|
|
|
|
|
|
| Re: [GMCnet] Restoration. 12V. Why did Coachman use a ground wire everywhere? [message #293405 is a reply to message #293403] |
Mon, 04 January 2016 10:27   |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
My reply is to Bob's query. Coachman used full ground path conductors for a
variety of reasons. One, they did not trust the integrity of the aluminum
body rib structure. Too much adhesive was used to adhere the body panels to
the ribs, some of it ran down to the junctions between the ribs and the
chassis. Two, they didn't exactly hire rocket scientists to upfit the
coaches. Those guys were only a step or two up the evolutionary chain from
those who swung through trees. They needed to be fast, and dumb enough to
want to work for Coachman, and able to fog a mirror when they breathed on
it. They used screw guns to run fasteners, and I have found many, many
places where 12 volt grounds were attached with screws where the ring
terminals were loose under the screw heads. The quality of their
workmanship was what it was in the 70's. Sloppy, fast and poorly executed,
and top that with no supervision, and you see the picture. Circuit chasing
in any GMC is always an adventure. I would advise you to remember that once
that spray foam hides all the wires and connections, and the modules are
put back in place, it is an impossible task to trace conductors if you do
not have the terminal ends right in front of you in a box or panel. Just
easier. Way easier. But, like Jim Bounds is know to say, This is America,
after all. Land of free choices. Spend your money how you see fit.
Jim Hupy
Salem, Or
78 GMC Royale (by Coachman) 403
On Mon, Jan 4, 2016 at 7:48 AM, Thomas Phipps wrote:
> Belts and Suspenders. I agree with Matt. Less call backs equals more
> happy customers.
> Tom, MS II
> --
> 1975 GMC Avion
> KA4CSG
>
> _______________________________________________
> 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
|
|
|
|
|
|
| Re: [GMCnet] Restoration. 12V. Why did Coachman use a ground wire everywhere? [message #293407 is a reply to message #293388] |
Mon, 04 January 2016 11:20 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Here's one meant to run checks on AC wiring, under 20 scoots. I suspect the 'fox' powers from the outlet, and the 'hound' uses a battery. Consequently, a bit of warranty - voiding surgery would likely be needed to use it on single wires that aren't energized. I'd pay the loot and get the Triplett for GMC work, but the el cheapo could I suspect be made to work also. What's your time worth?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
|
|
| Re: [GMCnet] Restoration. 12V. Why did Coachman use a ground wire everywhere? [message #293410 is a reply to message #293388] |
Mon, 04 January 2016 11:59 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
The Fox and Hound works on low voltage - it is in fact never to be connected to an energized AC circuit. It works will on house wiring >As long as the power is turned off<. It consists of a 'garbage' oscillator which generates a messy square wave full of harmonics at a very low source impedance. The hound is a high gain high impedance input audio amplifier. The signal will travel on a conductor, and the hound will pick it up when the input probe is close to the wire with the signal. In a bundle, the signal will cross couple to other wires, but when you touch each one it's obvious which one has the fox connected - it is much louder.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
|
|
| Re: [GMCnet] Restoration. 12V. Why did Coachman use a ground wire everywhere? [message #293418 is a reply to message #293388] |
Mon, 04 January 2016 15:05 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
|
Senior Member |
|
|
Even on a fully piped conduit 120VAC wiring system you still have to pull bonding grounds just because of the potential of a fitting getting loose or the lock nut to the box was never really tightened down. I got hit hard the other day with 120Vac and I can say it ain't fun like it use to be. Not worth the risk to not do it.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
|
|
|
|
|
|
|
|
| Re: [GMCnet] Restoration. 12V. Why did Coachman use a ground wire everywhere? [message #293502 is a reply to message #293388] |
Thu, 07 January 2016 06:48 |
rcjordan
Messages: 1913
Registered: October 2012
Location: Elizabeth City, North Car...
Karma: 1
|
Senior Member |
|
|
Aluminum wire has another problem; with its higher rate of thermal expansion, soft aluminum wire tends to over compress itself (creep) by virtue of its own expansion when captured in a slower expanding copper-rated lug. This eventually leads to a loose joint, oxidation, and an arc. That's why aluminum Romex was discontinued a couple of decades ago. Aluminum alloy compression lugs which have a thermal expansion rate closer to that of the wire are used to terminate.
SOLD 77 Royale Coachmen Side Dry Bath
76 Birchaven Coachmen Side Wet Bath
76 Eleganza
Elizabeth City, NC
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
