| Wiring Diagram Question? - Suspension Air Compressor Circuit [message #236206] |
Wed, 15 January 2014 09:43  |
Clark76
Messages: 62
Registered: February 2010
Karma: -2
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SUSPENSION AIR COMPRESSOR CIRCUIT: On the wiring diagram http://www.bdub.net/wirediagrams/75-engine-HEI.pdf (2/3 down the page), the "SUSPENSION AIR COMPRESSOR" circuit shows a 30 Amp breaker, (The large silver one that is in the left of fuse block behind the glove box). On the diagram, it shows down stream of the 30 Amp breaker the #14 brown wire going to the AIR COMPRESSOR (load) my old Dana Compressor.
ALSO, To the right of the breaker on the diagram, it shows a spur coming off the #14 brown above to another #14 brown then to a #12 Black wire labeled "FEED THROUGH CAPACITOR RADIO - RPO", then re-joining to the pressure switch and the AIR COMPRESSOR load.
I RE WIRED THE AIR COMPRESSOR to go on a new circuit with a RELAY and it's own 30 Amp fuse in front of the fire wall to the new Thomas Pump (See my prior post on wiring that was compromised due to excessive load): http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=233394&rid=1813#msg_233394
WIRING DIAGRAM QUESTION?: By permanently removing the large silver 30 Amp Fuse in the Fuse Block (Don't need it since I have a new Air Compressor Circuit), will this have any adverse affect on any other circuits? - such as the FEED THROUGH CAPACITOR RADIO -RPO (if this is indeed part of the circuit, I am not sure what it is)?
I am not that savvy on wiring diagrams, seeking advice from someone who knows how to read them better than I. - Clark
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| Re: Wiring Diagram Question? - Suspension Air Compressor Circuit [message #236207 is a reply to message #236206] |
Wed, 15 January 2014 09:49  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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I haven't looked at the diagram but feed through capacitors are used to minimize motor electrical noise being introduced into the radio. If you look up that RPO I'll bet it is the radio. If you are no longer running the compressor motor through it then that capacitor is doing nothing for you.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Wiring Diagram Question? - Suspension Air Compressor Circuit [message #236211 is a reply to message #236209] |
Wed, 15 January 2014 10:14 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Sorry, I lived in the world of acronyms or abbreviations all of my working life. So It did on occure to me that other do not understand them.
RPO is Regular Production Option. They are the 3 digit codes that specify what options were installed on the vehicle as it was manufactured. You can find the listing for your vehicle on the label inside the glove compartment. Unfortunately in my case someone removed mine before it got it. In most cases a GM dealer can look up the list on most GM vehicles but not the GMC. I have been told that Cinnabar received those records for GM years ago and threw them away. I have no personal knowledge of this but if your label is missing, I know of no place where you can retrieve them any more on a GMC MH.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Wiring Diagram Question? - Suspension Air Compressor Circuit [message #236221 is a reply to message #236206] |
Wed, 15 January 2014 11:47 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Clark:
Re
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WIRING DIAGRAM QUESTION?: By permanently removing the large silver 30 Amp Fuse in the Fuse Block (Don't need it since I have a new Air Compressor Circuit), will this have any adverse affect on any other circuits? - such as the FEED THROUGH CAPACITOR RADIO -RPO (if this is indeed part of the circuit,
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From the diagram that circuit comes from the ign switch ( accessory side) through the breaker directly to the compressor pressure switch and does not feed other items. ( from the factory).
Removing the breaker should not affect normal factory items. ( who knows if some other owner tapped into that circuit) The RPO means that if the vehicle has that Option added (radio) that circuit will be used in the wiring harness. As others have said, the capacitor is used to quite radio noise from the sparking brushes of the compressor motor.
However now that you have bypassed the circuit, this is a perfect circuit where you should tap into for any other accessories you want to be added to your coach that is switched by the ignition. (Fog lights, brake vacuum pump, back up camera, etc.) Terminate the original compressor wire to a small fuse block in an easily accessible location .
Best regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: Wiring Diagram Question? - Suspension Air Compressor Circuit [message #236225 is a reply to message #236206] |
Wed, 15 January 2014 12:05 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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In addition:
I said that the compressor circuit came from the accessory side of the ignition switch. I should have clarified that it uses the accessory contacts ( the ignition switch has multiple contacts) This set of contacts are only on when the ignition switch is in the run and ACCESSORY position and not on in the START position.
That will make a difference when you use it for some applications.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
[Updated on: Wed, 15 January 2014 12:12] Report message to a moderator |
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| Re: Wiring Diagram Question? - Suspension Air Compressor Circuit [message #236228 is a reply to message #236206] |
Wed, 15 January 2014 12:17 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Pressed the send button too fast
For you email users. The correct statement is :
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This set of contacts are only on when the ignition switch is in the run and ACCESSORY position and not on in the START position.
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The forum statement has been corrected
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: [GMCnet] Wiring Diagram Question? - Suspension Air CompressorCircuit [message #236236 is a reply to message #236218] |
Wed, 15 January 2014 16:09 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Southmayd,
Don't know what you paid for the Thomas, however, for the record this is the highest capacity pump that Viair makes and will leave
the Thomas or Dana for DEAD!
http://viaircorp.com/480C.html
It can be purchased here for $214.25 with FREE SHIPPING!
http://tinyurl.com/oce4xe8
http://www.ebay.com/itm/Viair-480C-Single-Pewter-Compressor-200-PSI-Max-Air-Ride-Suspension-Bags-Valves-/231033129513#ht_5581wt_1076
This is an UNBELIEVABLE BARGAIN!
This is the pump I have in Double Trouble and I just ordered one for The Blue Streak!
Regards,
Rob M.
Sydney, Australia
-----Original Message-----
From: Southmayd
I ordered the Thomas Air Compressor from Cinnabar. Cinnabar Item #3172 Air Compressor HD*T2 + a Base Plate Item #3171.
Single cylinder, quicker pump up than Dana Compressor and can run longer before resting.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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