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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Oil Pressure Gauge Pinned (https://www.offshoreonly.com/forums/general-q/250976-oil-pressure-gauge-pinned.html)

RunninHotRacing163.1 04-08-2011 01:11 PM
Originally Posted by Randy Nielsen (Post 3371452)
I think you may have a short to ground in the sender wiring cause if you ground the sender wire the guage should peg
+100 :drink:
good luck

FIXX 04-08-2011 02:43 PM
Fixx
 
Originally Posted by djpfountain29 (Post 3371439)
I have a 29' Fountain with twin 454 Mag MPIs and my oil pressure gauges stay pinned as soon as I turn the key. I changed the oil pressure sending unit, but the gauge still goes from zero to pinned as soon as i turn the key. I am thinking there is a bad ground, but I am wondering if anyone else has had this problem before and what they did.
? are both engines doing the same thing?

blue thunder 04-08-2011 05:16 PM
That's why I figured it was a polarity issue mrfix.

djpfountain29 04-08-2011 07:22 PM
The gauges are stock Gaffrig Gauges and both port and starboard oil pressure gauges are doing the same thing.

jeffswav 04-08-2011 08:25 PM
Originally Posted by blue thunder (Post 3371756)
That would depend on if the gage is sinking or sourcing.
I agree, I have seen gages float before, seeking a ground. When you turn different things on or off the gages would change. But to peg out as soon as you hit the key would almost have to be a dead short. Very strange both engines would be doing the same thing. Take a meter and see if the sender wire is shorted, at both ends. I believe the senders are 0-88 ohms, get some resistors and connect them from the sender wire to ground.

FIXX 04-08-2011 11:12 PM
Fixx
 
did you use gaffrig senders?? they have their own senders for their gauges or they will be off when reading them.

Randy Nielsen 04-09-2011 01:33 AM
mrfixxall you are the bomb!!! I have seen all kinds of wiring clusterf@cks in boats & cars. If both guages are doing the same thing & senders & guages are the same, stereo? speakers? good question I have seen with custom vans they screwed the panels & such right through wiring harnesses & with boats the pounding they take people put longer screws in the speakers that is why I mentioned sharp edges or studs

ezstriper 04-10-2011 12:18 PM
did you start the engines ?? may be normal without running ?

bigblue 04-10-2011 12:43 PM
Originally Posted by Griff (Post 3371470)
If you used sealer on the sender, it may not be grounding properly. The sender grounds itself to the engine block. It could also be bad ground on the back of the gauge.
Absolutely!! I had sealer on the NPT and I was goin crazy!!!! Then I gave it a little tweak and I had a normal functional gauge!!:drink:

jeffswav 04-10-2011 11:12 PM
Good call Griff, sounded like a short to me.


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