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Twin Intake Wiring Diagram

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Old 09-24-2009, 12:17 AM
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Default Twin Intake Wiring Diagram

I am about to install a second walbro pump and wanted to know if this wiring diagram is correct.
Thanks!
Attached Thumbnails Twin Intake Wiring Diagram-walbro-wiring.jpg  
Old 09-24-2009, 08:54 AM
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Looks right to me..

-30 = constant [positive (+)] power (usually wired directly to car battery)
-85 = coil ground (wired to the negative (-) battery terminal or any grounded metal panel in the car)
-86 = coil power (wired to the control source. could be a switch, or it could be the car's IGN or ACC circuit.)
-87 = switched [positive (+)] power output. (when the relay coil is powered, lead/pin 87 is connected to lead/pin 30)
-87a = [on 5 lead/pin relays only] this lead/pin is connected to lead/pin 30 when the coil is NOT powered.
Old 09-24-2009, 03:23 PM
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The wiring from my understanding looks good. Where I am getting confused at is with the Hobbs switch, I assume this is going to be boost activated to turn on the second pump, but don't see how in your wiring diagram.
Any other information will be helpful as I plan to do this same thing soon.
Old 09-24-2009, 03:58 PM
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The first pump I ran a new power to relay then triggered off stock fuel pump wire.
Second pump triggers off hobb switch at 4psi.
Old 09-24-2009, 09:18 PM
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Originally Posted by SLOW30th-TA
The wiring from my understanding looks good. Where I am getting confused at is with the Hobbs switch, I assume this is going to be boost activated to turn on the second pump, but don't see how in your wiring diagram.
Any other information will be helpful as I plan to do this same thing soon.
I *think* this is how the relay works. When the hobbs switch sees 4 psi, the switch closes. when this happens, the the pump gets the voltage. I could have this terribly wrong and suck at wiring so i would greatly appreciate any help.
Old 09-27-2009, 01:52 PM
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bump!
Old 12-24-2010, 03:50 PM
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sorry for res-erecting a dead thread but I have seen this same diagram with the 85 and 86 terminals on the relay flipped. What would be different between these two set-ups?
Old 12-25-2010, 07:53 PM
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Originally Posted by TGriz
sorry for res-erecting a dead thread but I have seen this same diagram with the 85 and 86 terminals on the relay flipped. What would be different between these two set-ups?
You can put the Hobbs switch on 85 or 86 and it will be fine. Either one will complete the circuit once you hit 4lbs of boost.
Old 12-25-2010, 10:34 PM
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Originally Posted by Rick_Vor
You can put the Hobbs switch on 85 or 86 and it will be fine. Either one will complete the circuit once you hit 4lbs of boost.
ok. thanks for clearing that up!



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