| which wire is positive? [message #236935] |
Tue, 21 January 2014 17:43  |
74CanyonLands
Messages: 81
Registered: September 2013
Location: Los Angeles
Karma: 0
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So I purchased a new fresh water pump to replace the old OEM model and the original wires are one brown and one white. The new pump of course has red and black.
So which is positive on the OEM wiring?
Thanks gang!
CR
Curt Remington,
74 Canyonlands
Los Angeles, CA
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| Re: which wire is positive? [message #236939 is a reply to message #236935] |
Tue, 21 January 2014 18:28  |
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WildBill
Messages: 232
Registered: January 2014
Karma: 1
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I don't have a wiring diagram yet so a test light with the lead connected to the chassis and the probe in one of the terminals it will light up when you find positive. A volt meter will work, if digital if red lead hooked to ground will read negative voltage if meter hooked up to both terminals, VOM ground or black lead to chassis same as test light. New pump red will be positive.
I would guess brown is positive.
[Updated on: Tue, 21 January 2014 18:35] Report message to a moderator |
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| Re: which wire is positive? [message #236950 is a reply to message #236942] |
Tue, 21 January 2014 20:39 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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if you wire it opposite it problably turns the wrong way White is positiv
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: which wire is positive? [message #236951 is a reply to message #236940] |
Tue, 21 January 2014 21:05 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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The 1973 wiring diagram shows white is Ground and brown goes to an off on switch. On the other side of the switch the wire color changes to Lt. green and goes to Fuse #4.
I did not check other years but there is no reason to believe it would have changed or been reversed.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: which wire is positive? [message #236952 is a reply to message #236935] |
Tue, 21 January 2014 21:06 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| 74CanyonLands wrote on Tue, 21 January 2014 17:43 |
So I purchased a new fresh water pump to replace the old OEM model and the original wires are one brown and one white. The new pump of course has red and black.
So which is positive on the OEM wiring?
Thanks gang!
CR
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12V house wiring on a '74 uses white as the negative.
(this is not the case on chassis wiring)
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] which wire is positive? [message #236953 is a reply to message #236951] |
Tue, 21 January 2014 21:12 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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As old and tampered with these coaches are, I would verify polarity with a
DMM. These pumps will run either direction depending upon polarity if they
are the rotary style unit. They do not pump water very well in reverse.
Jim Hupy
Salem, Or.
78 GMC Royale 403
On Jan 21, 2014 7:05 PM, "Ken Burton" <n9cv@comcast.net> wrote:
>
>
> The 1973 wiring diagram shows white is Ground and brown goes to an off on
> switch. On the other side of the switch the wire color changes to Lt.
> green and goes to Fuse #4.
>
> I did not check other years but there is no reason to believe it would
> have changed or been reversed.
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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