jc4 vacuum pump wiring

[LQQKatJon]

Ok,

just wanting a little clarification:

NC = no connection????

I see in the power point, there are 3 wires off the molex connection, however, it is circled "4 wires used".

the diagrams show 4 items:

12+
NC
ACC
GND.

the NC in the pin out diagram says it is a ground on the pump.

I only have 3 pins that came with the connector.

--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/

 

[emerystora]

Jon

NC is usually associated with relays or switches and means Normally Closed.

I haven’t seen your diagram though.

Emery Stora
77 Kingsley
Frederick, CO

>
> Ok,
>
> just wanting a little clarification:
>
> NC = no connection????
>
> I see in the power point, there are 3 wires off the molex connection, however, it is circled "4 wires used".
>
> the diagrams show 4 items:
>
> 12+
> NC
> ACC
> GND.
>
> the NC in the pin out diagram says it is a ground on the pump.
>
>
> I only have 3 pins that came with the connector.
>
>
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[Ken H.]

Jon,

This should clarify 'most anything about the JC-4:

http://www.gmcmhphotos.com/photos/g4896-vacuum-booster-pump-auxiliary-gmc-jc4.html

Ken H.

> Ok,
>
> just wanting a little clarification:
>
> NC = no connection????
>
> I see in the power point, there are 3 wires off the molex connection,
> however, it is circled "4 wires used".
>
> the diagrams show 4 items:
>
> 12+
> NC
> ACC
> GND.
>
> the NC in the pin out diagram says it is a ground on the pump.
>
>
> I only have 3 pins that came with the connector.
>

 

[LQQKatJon]

The slideshow and other info on gmcmhphotos is where my question derives.

http://www.gmcmhphotos.com/photos/vacuum-booster-pump-auxiliary-gmc-jc4/p24283-jc4-pump.html

Position C. Says NC

Right- usually normally closed.

The oem connector and pump only came with 3 pins to connect wires. And the slide showing the molex has only 3 wires.

So i am guessing that c position that is indicated as ground on the pump pinout is not needed. (Have pin A as ground)

???
--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/

 

[Matt Colie]

> The slideshow and other info on gmcmhphotos is where my question derives.
>
> http://www.gmcmhphotos.com/photos/vacuum-booster-pump-auxiliary-gmc-jc4/p24283-jc4-pump.html
>
>
> Position C. Says NC
>
> Right- usually normally closed.
>
>
> The oem connector and pump only came with 3 pins to connect wires. And the slide showing the molex has only 3 wires.
>
> So i am guessing that c position that is indicated as ground on the pump pinout is not needed. (Have pin A as ground)
>
>
> ???

Jon,

In such case as a device, NC usually means No Connection.
Frequently, connector with more than the minimum pins are used for a variety of reasons.
The three biggest are:
- They ordered a connector with more capability and found they didn't need it.
- They needed to differentiate it from another connector.
- They were protecting for a future feature.

Matt

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

 

[Ken H.]

It's been years since I fooled with one, but the instructions seem clear to
me to say:

A=Ground
B=D=+12 VDC (Ign)

The other pins are either NC=No Connection or un-needed inputs.

Try it.

Ken H.

> The slideshow and other info on gmcmhphotos is where my question derives.
>
> http://www.gmcmhphotos.com/photos/vacuum-booster-pump-auxili
> ary-gmc-jc4/p24283-jc4-pump.html
>
>
> Position C. Says NC
>
> Right- usually normally closed.
>
>
> The oem connector and pump only came with 3 pins to connect wires. And
> the slide showing the molex has only 3 wires.
>
> So i am guessing that c position that is indicated as ground on the pump
> pinout is not needed. (Have pin A as ground)
>
>
> ???
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>