Oil Pressure switch polarity
06-04-2009, 01:16 AM
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Car: '83 Berlinetta
Engine: 383 CI
Transmission: T56
Axle/Gears: 3.73, Eibachs, Tokiko Illuminas,
Oil Pressure switch polarity
Hi. I was wondering if it matters which side of the oil pressure switch is grounded to the body?
Thanks,
Jon
Thanks,
Jon
06-04-2009, 02:43 AM
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Car: 87 Formula/ 00 Xtreme
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Re: Oil Pressure switch polarity
Very much so.
Neither side is grounded.
Wiring goes from Battery (hot side of fuel pump relay) -> OPS -> Pump side of relay wiring.
It is only fail safe power to the fuel pump in the event the relay fails.
Neither side is grounded.
Wiring goes from Battery (hot side of fuel pump relay) -> OPS -> Pump side of relay wiring.
It is only fail safe power to the fuel pump in the event the relay fails.
06-04-2009, 03:08 AM
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Car: '83 Berlinetta
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Re: Oil Pressure switch polarity
Oh oh. Mine has one terminal grounded to the firewall!!
P.S. I really like the quote at the bottom of your post.
Thanks,
Jon
P.S. I really like the quote at the bottom of your post.
Thanks,
Jon
06-04-2009, 03:27 AM
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Car: 87 Formula/ 00 Xtreme
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Re: Oil Pressure switch polarity
Heh, thanks 
When the switch reaches 4psi oil pressure, it closes.
When the switch reaches 4psi oil pressure, it closes.
06-04-2009, 09:44 AM
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Re: Oil Pressure switch polarity
I saw your other post about the fuel pump fuse blowing when you crank the car.
I would say that the oil pressure switch ground is your problem.
The switch is supplied with 12V from the fuel pump fuse and when the oil pressure builds up, it turns the fuel pump on. It's a back up system for the ECM controlled relay.
If the switched side of the oil pressure switch is grounded, it takes a crank or two to ground the hot wire and blow the fuse.
Hope this helps.
Lou
I would say that the oil pressure switch ground is your problem.
The switch is supplied with 12V from the fuel pump fuse and when the oil pressure builds up, it turns the fuel pump on. It's a back up system for the ECM controlled relay.
If the switched side of the oil pressure switch is grounded, it takes a crank or two to ground the hot wire and blow the fuse.
Hope this helps.
Lou
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