79 Oil Pressure Gauge
Thread Starter
Melting Slicks
Joined: Dec 2009
Posts: 3,233
Likes: 657
From: Thunder Bay
79 Oil Pressure Gauge
I finally got the '79 back together after taking the engine out to fix a few leaks, and changing the heater core. I fired it up tonight and everything seems to work except my oil pressure gauge. It is pinned fully to the right ( indicates 80 lbs.+ ). It makes no difference if I disconect the sender, or ground the sender wire, the gauge reaqds the same. If I understand the way the oil pressure gauge works, that means I have an open circuit between the gauge and the sender. Do I have this right?
Thread Starter
Melting Slicks
Joined: Dec 2009
Posts: 3,233
Likes: 657
From: Thunder Bay
http://forums.corvetteforum.com/c3-g...e-problem.html
Former Vendor
Joined: Aug 2006
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
open circuit will put the needle right above the right hand rivet on the face. Is this where it is pointing.. or is it on 80? And if pulling the wire from the sender and grounding it out makes no change then you have an issue either between the gauge and the sender or you have a gauge problem.
It is possible the finger on the printed circuit has moved when the connector was plugged in. If I'm right so far, I'd pull the cluster and check the printed circuit. When they (the pcb's) get old the fingers determinate from the plastic and can cause headaches. If you don't see an issue there then test continuity on the ohms pin to the sender and see if that wire is good.
Next.. on a bench I would deflect test the gauge. Power and ground.. see if the gauge pegs to the right face rivet.. then ground out the signal stud to ground and it should go to 0. I think most of this is posted in the thread drwet posted above.
Post again.. and watch that video posted on the other thread about fuel gauges.. the oil pressure gauge works the exact same way.. they are twins with few differences.
Willcox
It is possible the finger on the printed circuit has moved when the connector was plugged in. If I'm right so far, I'd pull the cluster and check the printed circuit. When they (the pcb's) get old the fingers determinate from the plastic and can cause headaches. If you don't see an issue there then test continuity on the ohms pin to the sender and see if that wire is good.
Next.. on a bench I would deflect test the gauge. Power and ground.. see if the gauge pegs to the right face rivet.. then ground out the signal stud to ground and it should go to 0. I think most of this is posted in the thread drwet posted above.
Post again.. and watch that video posted on the other thread about fuel gauges.. the oil pressure gauge works the exact same way.. they are twins with few differences.
Willcox
Last edited by Willcox Corvette; Feb 7, 2013 at 10:34 AM.
Thread Starter
Melting Slicks
Joined: Dec 2009
Posts: 3,233
Likes: 657
From: Thunder Bay
Thanks for the help, guys. I love this forum. Sometimes it helps to just bounce ideas off other guys when you're trying to troubleshoot a problem.
I solved the gauge problem. I was going to remove the gauge cluster because I was pretty convinced the problem was the connection at the printed circuit. I've had that problem many times before, and though the PC on my car was new a couple of years ago, I figured it was still the weak link. Before I pulled the gauge cluster out, I figured I'd take my inspection camera and see what I could see in there. I pulled out the glove box and fed the camera in, and sure enough, the connector wasn't fully engaged. I could just barely reach in with my hand and snap the connector in place. Problem solved.
Thanks again to everyone who helped!
I solved the gauge problem. I was going to remove the gauge cluster because I was pretty convinced the problem was the connection at the printed circuit. I've had that problem many times before, and though the PC on my car was new a couple of years ago, I figured it was still the weak link. Before I pulled the gauge cluster out, I figured I'd take my inspection camera and see what I could see in there. I pulled out the glove box and fed the camera in, and sure enough, the connector wasn't fully engaged. I could just barely reach in with my hand and snap the connector in place. Problem solved.
Thanks again to everyone who helped!
