STS Oil Pump, how to wire it??
Apr 1, 2009 | 07:23 PM
#31
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I do not have a wiring diagram so I am trying to go from the instructions and my wiring but it is a little different.
You should have a wiring harness that goes to the oil return pump with a plug-in connector to the the harness that runs along the firewall. There is a second relay that you show in your diagram and the harness on mine splits before it and ends in a connector that the rear harness plugs into. On mine it has:
1.) White wire to Hobbs switch (ground for buzzer in cab). The Hobbs switch is grounded to the frame. So white wire on one side and ground to frame on the other side of the switch.
2.) Yellow wire to outlet side of pump (-) on top of pump.
3.) Black wire to inlet side of pump (+) on top of pump.
4.) Green wire folded into harness for your own use. I used it to power my boost control.
You will notice the Yellow wire has two sources, one side of which runs through the high watt resistor (Terminal E). This is the normal reduced power to the pump that is switched on when the vehicle is started. Power is switched to the full power side of the wire (Terminal A) when the relay receives a signal from the Hobbs switch by the intake at 1 psi boost (blue wire Terminal B).
G2 is the signal wire to the main relay to switch the relay on when the vehicle is running. It should connect to the gray fuel pump wire (on mine at least it is gray) and is active whenever the fuel pump has power. The gray wire runs from the under hood fuse block and you need to take the plastic cover off from around the fuse block. It runs in the large wire loom that goes to the engine and should be easy to find once the plastic cover is removed from around the under hood fuse block.
G1 is power to the buzzer.
White is the wire to the Hobbs switch by the fuel pump.It is grounded through the switch when the oil pressure in the oil return line builds up to 3 psi.
I think G1 and white wire terminate in a phone jack that the wiring to the buzzer in the cab plugs into.
F1 = Red power wire to one side of the Hobbs switch by the intake. I am not sure where the other leg of this red wire is attached unless you have the switch in the cab to turn the pump on high speed. (If you have the switch in the cab then you appear to be missing a wire to it and there will be a red, blue and brown wire to this switch (on mine that is) and the wiring will be a little different than discussed here).
Short brown wire goes from the other side of the Hobbs switch to the terminal on the PCV Solenoid.
B = Blue wire to side of Hobbs switch with the short brown wire (opposite red power wire). Goes to signal 2nd relay to switch oil pump onto full voltage and therefore high speed (Terminal B).
When the Hobbs switch by the intake sees 1 psi boost it sends power to the PCV Solenoid to vent the crankcase to the atmosphere and a signal to the second relay to switch the oil pump onto full voltage and therefore high speed.
There should also be a ground wire to the base of the PCV Solenoid that is connected to the factory bolt hole in the intake manifold because it is not grounded.(That may be i1 as the main relay is grounded to the firewall with a short ground wire).
H = red power wire to main relay as covered before and is connected to the the red positive terminal block by the alternator.
F2 = red power wire to second relay to active oil return pump.
I hope that covers it. Sorry to take so long to get this done. If you have the switch in the cab for the high speed to the pump then the wiring will be a little different and I can cover it.
You should have a wiring harness that goes to the oil return pump with a plug-in connector to the the harness that runs along the firewall. There is a second relay that you show in your diagram and the harness on mine splits before it and ends in a connector that the rear harness plugs into. On mine it has:
1.) White wire to Hobbs switch (ground for buzzer in cab). The Hobbs switch is grounded to the frame. So white wire on one side and ground to frame on the other side of the switch.
2.) Yellow wire to outlet side of pump (-) on top of pump.
3.) Black wire to inlet side of pump (+) on top of pump.
4.) Green wire folded into harness for your own use. I used it to power my boost control.
You will notice the Yellow wire has two sources, one side of which runs through the high watt resistor (Terminal E). This is the normal reduced power to the pump that is switched on when the vehicle is started. Power is switched to the full power side of the wire (Terminal A) when the relay receives a signal from the Hobbs switch by the intake at 1 psi boost (blue wire Terminal B).
G2 is the signal wire to the main relay to switch the relay on when the vehicle is running. It should connect to the gray fuel pump wire (on mine at least it is gray) and is active whenever the fuel pump has power. The gray wire runs from the under hood fuse block and you need to take the plastic cover off from around the fuse block. It runs in the large wire loom that goes to the engine and should be easy to find once the plastic cover is removed from around the under hood fuse block.
G1 is power to the buzzer.
White is the wire to the Hobbs switch by the fuel pump.It is grounded through the switch when the oil pressure in the oil return line builds up to 3 psi.
I think G1 and white wire terminate in a phone jack that the wiring to the buzzer in the cab plugs into.
F1 = Red power wire to one side of the Hobbs switch by the intake. I am not sure where the other leg of this red wire is attached unless you have the switch in the cab to turn the pump on high speed. (If you have the switch in the cab then you appear to be missing a wire to it and there will be a red, blue and brown wire to this switch (on mine that is) and the wiring will be a little different than discussed here).
Short brown wire goes from the other side of the Hobbs switch to the terminal on the PCV Solenoid.
B = Blue wire to side of Hobbs switch with the short brown wire (opposite red power wire). Goes to signal 2nd relay to switch oil pump onto full voltage and therefore high speed (Terminal B).
When the Hobbs switch by the intake sees 1 psi boost it sends power to the PCV Solenoid to vent the crankcase to the atmosphere and a signal to the second relay to switch the oil pump onto full voltage and therefore high speed.
There should also be a ground wire to the base of the PCV Solenoid that is connected to the factory bolt hole in the intake manifold because it is not grounded.(That may be i1 as the main relay is grounded to the firewall with a short ground wire).
H = red power wire to main relay as covered before and is connected to the the red positive terminal block by the alternator.
F2 = red power wire to second relay to active oil return pump.
I hope that covers it. Sorry to take so long to get this done. If you have the switch in the cab for the high speed to the pump then the wiring will be a little different and I can cover it.
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