| [GMCnet] ELECTRIC FUEL PUMP / OIL PRESSURE SAFTY SWITCH HOOKUP [message #163584] |
Mon, 19 March 2012 22:51  |
larry erd
Messages: 132
Registered: August 2010
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I need a little help, I have just a few things to finish up before
I can start up my 77 GMC chassis restoration. One being wiring
my carter fuel pump through the new oil pressure switch I got from
Jim K. The switch has 3 terminals, I assume one to the pump, one
to the starter , and one to the the ignition side of key switch. OK
where is the best location to hook up to, and which terminal goes
where. there is no continuity between any of the terminals on the
pressure switch. thanks for your thoughts.
Larry Erd
ex77 Kingsley
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| Re: [GMCnet] ELECTRIC FUEL PUMP / OIL PRESSURE SAFTY SWITCH HOOKUP [message #163587 is a reply to message #163584] |
Mon, 19 March 2012 23:11  |
Mr ERFisher
Messages: 7117
Registered: August 2005
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here go
http://gmcmotorhome.info/engine.html#pump
click on picture to get large schematic
gene
On Mon, Mar 19, 2012 at 8:51 PM, Larry Erd <1ljerd@gmail.com> wrote:
> I need a little help, I have just a few things to finish up before
> I can start up my 77 GMC chassis restoration. One being wiring
> my carter fuel pump through the new oil pressure switch I got from
> Jim K. The switch has 3 terminals, I assume one to the pump, one
> to the starter , and one to the the ignition side of key switch. OK
> where is the best location to hook up to, and which terminal goes
> where. there is no continuity between any of the terminals on the
> pressure switch. thanks for your thoughts.
>
> Larry Erd
> ex77 Kingsley
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] ELECTRIC FUEL PUMP / OIL PRESSURE SAFTY SWITCH HOOKUP [message #163595 is a reply to message #163584] |
Tue, 20 March 2012 00:00 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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There should be 3 terminals. It depends on what brand switch you have but some are labeled P, S, and I (I believe). They go to the Pump, Starter, and Ignition.
You most have continuity between P and S without the engine running or you have a bad switch.
With the engine running and the oil pressure up you must have continuity between P and I or the switch is bad.
On a coach with HEI, which you should have on a 1977 coach, a good place to attach the S lead to is the spare small terminal on the starter solenoid. A good place to get the ignition source is the HEI +12 power to the distributor. Both the distributor and the pump draw less than 1.5 amps each so the existing GMC wiring is more than adequate at both of those locations.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Tue, 20 March 2012 00:07] Report message to a moderator |
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| Re: [GMCnet] ELECTRIC FUEL PUMP / OIL PRESSURE SAFTY SWITCH HOOKUP [message #163596 is a reply to message #163595] |
Tue, 20 March 2012 00:09 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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| Ken Burton wrote on Tue, 20 March 2012 00:00 |
There should be 3 terminals. It depends on what brand switch you have but some are labeled P, S, and I (I believe). They go to the Pump, Starter, and Ignition.
You most have continuity between P and S without the engine running or you have a bad switch.
With the engine running and the oil pressure up you must have continuity between P and I or the switch is bad.
On a coach with HEI, which you should have on a 1977 coach, a good place to attach the S lead to is the spare small terminal on the starter solenoid. A good place to get the ignition source is the HEI +12 power to the distributor. Both the distributor and the pump draw less than 1.5 amps each so the existing GMC wiring is more than adequate at both of those locations.
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I just realized that you are on email so you do not get posting updates so here it the update I added to the previous posting:
On a coach with HEI, which you should have on a 1977 coach, a good place to attach the S lead to is the spare small terminal on the starter solenoid. A good place to get the ignition source is the HEI +12 power to the distributor. Both the distributor and the pump draw less than 1.5 amps each so the existing GMC wiring is more than adequate at both of those locations.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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