Oil Pressure gauge wiring
Discussion
Quick questions.
Should i have power at the oil pressure sensor?
Why does my gauge stay pinned at 5 bar just turning key on?
I checking wiring as per instructions for gauge.
Power at one post, ground at another post and direct to gauge for sender.
Wire connected to gauge side of sender.
Other wire for sender goes to warning light, this wire has 12v with key on?
engine does have oil pressure, confirmed with mechanical gauge, jumps to 60psi while cranking.
Should i have power at the oil pressure sensor?
Why does my gauge stay pinned at 5 bar just turning key on?
I checking wiring as per instructions for gauge.
Power at one post, ground at another post and direct to gauge for sender.
Wire connected to gauge side of sender.
Other wire for sender goes to warning light, this wire has 12v with key on?
engine does have oil pressure, confirmed with mechanical gauge, jumps to 60psi while cranking.
Gee I'm guessing that you have one of those new fancy LS motors?
I have 2 sensors with one wire each on my rusty old SBC.
One for the gauge with 12v from the gauge connected. It is a variable resistor which changes with pressure so making the gauge move.
The other is for the light which is purely a switch which allows current to flow when pressure is below 15psi and not when above.
The engine makes the neg side of the connection.
4 wires! I am confused
Sorry I can't help but i'm sure that somebody who can will give you a sensible answer.
I have 2 sensors with one wire each on my rusty old SBC.
One for the gauge with 12v from the gauge connected. It is a variable resistor which changes with pressure so making the gauge move.
The other is for the light which is purely a switch which allows current to flow when pressure is below 15psi and not when above.
The engine makes the neg side of the connection.
4 wires! I am confused
Sorry I can't help but i'm sure that somebody who can will give you a sensible answer.
Macgtech,
You are correct.
I ran new wires from battery + and - to gauge and a new run to gauge.
Same result.
Sensor is mounted on the output side of a remote filter housing. An fittings are grounded thru housing I assume( Yes I know its bad to assume.)
I tried a different gauge with similar results.
I have confirmed good pressure with mechanical gauge.
You are correct.
I ran new wires from battery + and - to gauge and a new run to gauge.
Same result.
Sensor is mounted on the output side of a remote filter housing. An fittings are grounded thru housing I assume( Yes I know its bad to assume.)
I tried a different gauge with similar results.
I have confirmed good pressure with mechanical gauge.
Edited by Rscocca on Thursday 18th December 19:09
Rscocca said:
Macgtech,
You are correct.
I ran new wires from battery + and - to gauge and a new run to gauge.
Same result.
Sensor is mounted on the output side of a remote filter housing. An fittings are grounded thru housing I assume( Yes I know its bad to assume.)
I tried a different gauge with similar results.
I have confirmed good pressure with mechanical gauge.
How many wires are coming out of the sender? Do you have a link to it online?You are correct.
I ran new wires from battery + and - to gauge and a new run to gauge.
Same result.
Sensor is mounted on the output side of a remote filter housing. An fittings are grounded thru housing I assume( Yes I know its bad to assume.)
I tried a different gauge with similar results.
I have confirmed good pressure with mechanical gauge.
Edited by Rscocca on Thursday 18th December 19:09
A traditional 4 wire sensor has your power +ve and power -ve, along with signal +ve and signal -ve.
The more usual 3 wire approach has a single earth (-ve), a power +ve and a signal +ve.
Two wire devices either change resistance (so you have a -ve and a +ve only and measure the voltage pull) or earth through the body.
The more usual 3 wire approach has a single earth (-ve), a power +ve and a signal +ve.
Two wire devices either change resistance (so you have a -ve and a +ve only and measure the voltage pull) or earth through the body.
An update to everyone, Problem found, I was having a near senior moment.
Basic principals of electricity. It will always be searching for a GROUND.
I had everything going thru an adaptor for the sensor that was not getting a proper ground.
Moved sensor to a different location and what ya know, it works.
Gotta learn to walk away every now and again.
Stubborn mule.
Basic principals of electricity. It will always be searching for a GROUND.
I had everything going thru an adaptor for the sensor that was not getting a proper ground.
Moved sensor to a different location and what ya know, it works.
Gotta learn to walk away every now and again.
Stubborn mule.
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