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TOPIC: Oil pressure indicator pegged all the way high

Oil pressure indicator pegged all the way high 15 Dec 2016 01:35 #1

  • wgander
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I changed the bulbs in my engine instruments and the oil pressure gauge needle goes all the way to high as soon as the ignition key is turned on and stays there, whether or not the engine's running.
I changed the light bulb again today and the needle still goes all the way to high as soon as I turn the key on, whether or not the engine's running.
The wires plug are in a plastic harness that plugs onto the back of the gauge; I took it off and put it back on several times, and tried wiggling the wires. I also checked the oil pressure sender, one light blue wire, it was snug.
So, what do I do next, to get the gauge to indicate correctly again? My engine usually indicates 40 PSI, sometime a little higher at high RPM.

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1998 Capri 1950CL
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Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
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Oil pressure indicator pegged all the way high 15 Dec 2016 02:07 #2

  • smitty477
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"So, what do I do next, to get the gauge to indicate correctly again?"

The gage is really just a ohmmeter which reads the signal sent by the sender. Somewhere you have a short at either the sender or at the gage connections and/or along the way. Since you have been working with the gage you will likely know where you might have pinched the wires/connectors for a short.
This short article will help as well...

www.jamestowndistributors.com/userportal/document.do?docId=835

Hope this helps

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Northport NY

Oil pressure indicator pegged all the way high 15 Dec 2016 14:14 #3

  • 2850Bounty
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It is unlikely that you made any change to the circuit connections. However, if there is another harness connection within this wiring, you may have accidently jiggled it and may have lost continuity.
Try looking for another connection close by.
If there is one, pull it apart and reconnect it.


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Oil pressure indicator pegged all the way high 15 Dec 2016 15:29 #4

  • smitty477
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If your gage is moving 'all the way high' to full pressure then you have a short. If it is reading all the way low (zero) then its an open.
Often you can short the wire where they terminate on the gage by rotating an uninsulated wire connector the hold-down frame which is grounded.
Here is a cut and paste from the linked article on troubleshooting on post #1 above.....

"2. Sender resistance can be measured to determine the sender's correct operation. Remove wire to gauge. Connect an ohmmeter to terminal of sender and to engine block. Approximate pressure sender resistance values are: ◦Zero pressure = 240 ohms
◦1/2 gauge reading = 103 ohms
◦full gauge pressure = 33 ohms.
◦You will get half these values on a dual gauge sender.

3. If sender is shorted (0 ohms) gauge will read above full gauge pressure reading.
4. If sender has infinite resistance (open) gauge will read below 0 PSI."
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Northport NY

Oil pressure indicator pegged all the way high 15 Dec 2016 18:03 #5

  • wgander
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Thanks for the replies. There isn't much space to work on the back of the instruments so I probably bumped something. I removed and replaced the harness that plugs onto the Oil Pressure Gauge a couple of times, and it still reads high. I didn't think of checking any of the other instrument harnesses. I'll check them all the next time I get to the boat: the problemt's got to be right there behind the panel.

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1998 Capri 1950CL
3 Liter MerCruiser
Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
2 batteries with Combiner, Joystick Wakeboard Tower

Oil pressure indicator pegged all the way high 16 Dec 2016 01:56 #6

  • builderdude
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Like smitty said, if it's pegged showing full pressure the senders wire would most likely be grounded out somewhere. You didn't accidently flip the connector at the back of the gauge or something? Remove the wire from the sender and see if it stays pegged or drops down to zero.

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Oil pressure indicator pegged all the way high 16 Dec 2016 05:05 #7

  • wgander
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I think the harness can only be installed one way. Needle went to zero when harness was removed or key turned off.

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1998 Capri 1950CL
3 Liter MerCruiser
Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
2 batteries with Combiner, Joystick Wakeboard Tower

Oil pressure indicator pegged all the way high 16 Dec 2016 06:26 #8

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So with the key in the on/run position remove the wire from the sending unit at the engine. If the Gauge goes to zero you probably have a faulty sender.

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Dave
Edmonds, WA
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'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
.030 over-Vortec top end-part closed cooled
***The rebuild of my 2556***
www.baylinerownersclub.org/index.php/for...ansom-repair-my-2556

Oil pressure indicator pegged all the way high 16 Dec 2016 11:54 #9

  • Chief Alen
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The 94' 2452 was a actual pleasure to work on the gauges, inside the cabin there was a snap on canvass cover that hid the back of all the gauges.

Had to clean a few spade connectors, add a fuel sniffer etc.

In your case i think maybe a connector got bent and is grounding out, a wire grounding out etc, behind the cluster..

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'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

Follow up 01 Sep 2017 06:15 #10

  • wgander
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It was the oil pressure gauge. I replaced the oil pressure sender and that made no difference. Replaced the gauge and it works correctly. Either the oil pressure gauge just so happened to fail when I was changing light bulb ,or more likely, I shorted the gauge circuit when working in that confined space.

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1998 Capri 1950CL
3 Liter MerCruiser
Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
2 batteries with Combiner, Joystick Wakeboard Tower
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