To my always helpful busnuts at BCM-
I've been having issues with my oil pressure gauge for some time; as in, it registers nothing. The gauge itself and the dashboard wiring *seem* to be fine. I suspect the problem is with the send. And my problem is that I don't know what I'm looking for!
Attached is a photo of the driver's side of my 6V92. There are three switches/sends attached to a hexagonal tube. The wiring to the middle switch appeared frayed so I replaced the end. After doing that, I got a brief reaction from the dashboard gauge when I started it up. Then the gauge went back to zero. So I'm thinking I'm on the right track here. Would just like to know what I'm looking at here, what I need to replace, and the correct terminology to use when seeking the part.
Thanks!!
Chuck
Oil sending units work off the resistance of the sender. If you jump the terminal at the sender on the engine to a ground, you should read maximum pressure at the gauge. If not, the problem is not your sender, it is either the wiring or the gauge itself.
--Geoff
Quote from: Geoff on May 06, 2016, 05:42:10 PMOil sending units work off the resistance of the sender. If you jump the terminal at the sender on the engine to a ground, you should read maximum pressure at the gauge. If not, the problem is not your sender, it is either the wiring or the gauge itself.
--Geoff
Do senders like these have two terminals (one for ground) or is the ground done through the fitting threads?
Both.
Quote from: Geoff on May 07, 2016, 06:53:53 PMBoth.
So - for the type with two connectors - if you bypass the entire sender and get max reading, it means the circuit up to the gauge and the gauge itself are good. After that, if you wire a known-good ground to the ground pin, and the reading changes, that points to a fault in the ground path; if not, the problem is likely to be in the sender?
My new Cummins engine has two senders; one on-off for the idiot light and one that is resistive for the gauge. Thanks for this info.