oil pressure sending unit help

[doboy]

hey guys,

my druck press gauge reading is stuck at 0-0.5 and I'm out of ideas, I suck at electrical troubleshooting, please help.

engine running at idle, wire on sensor gauge shows = 0
engine running at idle, wire not on sensor gauge shows = 5
engine running at idle, wire grounded on the engine gauge shows = 0

tested sender unit itself by placing red lead to the sender's prong and black lead to ground, started car and measured resistance in Ohms. I was told if I got fluctuating readings with changes in rpm, sender is good. if sender is bad it should read infinity. I got fluctuating readings, so I assume my sender is good.

battery reads 12.5v, so I assume my alternator is still good.

I thought maybe the female connector was too loose, so I ran a separate wire connecting the female connection to the sender's prong, started the car and still got a reading of 0.

suggestions anyone?

[island911]

If you take the green/red (iirc) wire off of the Oil Pressure Sensor (just right of the engine fan, 7mm nut) your dash-gauge should peg up to the top. That is, the gauge reads resistance to ground. -if that wire goes directly to ground, the gauge should read zero(ish) and if not connected it should read max.

ps, there's this Oil temp & pressure gauge / sender operation

[timmy2]

The senders have a habit of breaking/ corroding at the threaded brass portion where the nut goes on to secure the terminal stud.
Try using a little bit of solder and a soldering gun on the end of the threaded brass (get it good and hot) and see if it works again.


Sent from my iPhone using Tapatalk

[T77911S]

if the gauge reads 0 with the wire connected and 5 with it removed, the sender is bad, just buy a new one.