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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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 Posted: Mon Apr 15, 2019 2:15 pm Post subject: Oil pressure gauge pegs |
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Hey all,
So i am bench testing a new vdo op gauge using a oil filter sandwich adapter for the sending unit install. I run a wire from the G on the sender to the gauge signal peg. I am just holding this gauge in the engine compartment as a bench test. So i run a negative from gauge to ground strap and then run a positive from gauge to alternator 12v source. What happens is the gauge pegs all the way. What am I doing wrong? I had the same issue with a cheapo chinese gauge and sender a couple of weeks ago but wrote it off as crap. Same thing is happening with this brand new vdo so it is clearly something that I am doing wrong. Any clues here?
As far as gloshift adapter plate, i have read of those not grounding right. Could something be going on here? |
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jberger
Samba Member
Joined: November 17, 2003
Posts: 2476
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| Posted: Mon Apr 15, 2019 2:42 pm Post subject: Re: Oil pressure gauge pegs |
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| candyman wrote: |
Hey all,
So i am bench testing a new vdo op gauge using a oil filter sandwich adapter for the sending unit install. I run a wire from the G on the sender to the gauge signal peg. I am just holding this gauge in the engine compartment as a bench test. So i run a negative from gauge to ground strap and then run a positive from gauge to alternator 12v source. What happens is the gauge pegs all the way. What am I doing wrong? I had the same issue with a cheapo chinese gauge and sender a couple of weeks ago but wrote it off as crap. Same thing is happening with this brand new vdo so it is clearly something that I am doing wrong. Any clues here?
As far as gloshift adapter plate, i have read of those not grounding right. Could something be going on here? |
Run a temporary ground to the sender itself.
J |
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wesitarz
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Joined: August 20, 2012
Posts: 1491
Location: Victoria,B.C.Canada
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12115
Location: Port Manteau
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| Posted: Mon Apr 15, 2019 2:46 pm Post subject: Re: Oil pressure gauge pegs |
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Before I hooked up the sender on my VDO oil pressure gauge, it would peg whenever the key was on. I drove around like that for months. Once I hooked up the sender, it functioned as expected. As mentioned, you need to ground the base of the sending unit.
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'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 3:31 pm Post subject: Re: Oil pressure gauge pegs |
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| Grounded the base of the sender and no change, still pegs out. Super frustrated here. Sender is ground, gauge is grounded and with a 12 v source from alternator. What am i doing wrong here? For the sender, I ran a ground from one of the unused ports on the glowshift adapter to the engine itself, tested for continuity and there is between the sender and the engine, therefore sender is grounded correct? It is clearly something that I am doing wrong as I got the same exact results with a different set of gauges and senders |
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12115
Location: Port Manteau
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| Posted: Mon Apr 15, 2019 3:38 pm Post subject: Re: Oil pressure gauge pegs |
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Did you check continuity between gauge and sender? I've had visually perfect crimped fittings that did not convey continuity in the past. This is clearly an issue between ground the sender and the gauge.
_________________
Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 3:49 pm Post subject: Re: Oil pressure gauge pegs |
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| Zeitgeist 13 wrote: |
| Did you check continuity between gauge and sender? I've had visually perfect crimped fittings that did not convey continuity in the past. This is clearly an issue between ground the sender and the gauge. |
Thanks for that, just double checked and yes all good there. I got to reverse engineer this. Anyone have issues with the glowshift adaptor? |
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crazyvwvanman
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Joined: January 28, 2008
Posts: 9935
Location: Orbiting San Diego
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| Posted: Mon Apr 15, 2019 3:54 pm Post subject: Re: Oil pressure gauge pegs |
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Is it only with the engine running or is just having the key on enough?
Mark |
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DanHoug
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Joined: December 05, 2016
Posts: 4789
Location: Bemidji, MN
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| Posted: Mon Apr 15, 2019 4:01 pm Post subject: Re: Oil pressure gauge pegs |
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Glowshift adapters are anodized aluminum. anodize coatings are non-conductive. you must scratch thru the pretty coating at both the nut and the sender threads to make it functional.
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60% of what you find on the internet is wrong, including this post.
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 4:06 pm Post subject: Re: Oil pressure gauge pegs |
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| crazyvwvanman wrote: |
Is it only with the engine running or is just having the key on enough?
Mark |
Since im mocking it up im using the the alternator b+ As 12v source. Key on or off no difference |
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 4:08 pm Post subject: Re: Oil pressure gauge pegs |
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| DanHoug wrote: |
| Glowshift adapters are anodized aluminum. anodize coatings are non-conductive. you must scratch thru the pretty coating at both the nut and the sender threads to make it functional. |
Im running a temp ground from one port to the engine. With that connected i got continuity from sender body to ground. Im presuming that means its grounded correctly right? |
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 4:24 pm Post subject: Re: Oil pressure gauge pegs |
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| Not sure if this is a clue or not, with sender disconnected but gauge still grounded and 12v, it still pegs |
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tjet 
Samba Member
Joined: June 10, 2014
Posts: 3533
Location: CA & NM
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| Posted: Mon Apr 15, 2019 4:28 pm Post subject: Re: Oil pressure gauge pegs |
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| candyman wrote: |
| Not sure if this is a clue or not, with sender disconnected but gauge still grounded and 12v, it still pegs |
Your problem is at the gauge.
Recheck all your wires
Last edited by tjet on Mon Apr 15, 2019 4:30 pm; edited 1 time in total |
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candyman
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Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 4:29 pm Post subject: Re: Oil pressure gauge pegs |
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| tjet wrote: |
| Are you sure it's on the G lug? I think the other one is W. |
It is, i tried to take a vid of my setup, but cant upload it here for whatever reason |
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tencentlife
Samba Member
Joined: May 02, 2006
Posts: 10078
Location: Abiquiu, NM, USA
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| Posted: Mon Apr 15, 2019 4:40 pm Post subject: Re: Oil pressure gauge pegs |
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| candyman wrote: |
| Not sure if this is a clue or not, with sender disconnected but gauge still grounded and 12v, it still pegs |
Then ground the sender wire to same ground point, if gauge goes to zero, all is well with the gauge.
Then remove sender and test resistance by itself, G-pin to nipple. It's probably a 10-180ohm sender, so going by the way VDO gauges respond (opposite of most built-in gauges) it should be 10 ohm at rest.
If sender has the idiot light function as well the W pin to nipple should be 0 ohm.
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Paulbeard
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Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Mon Apr 15, 2019 5:04 pm Post subject: Re: Oil pressure gauge pegs |
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I had to send back a gauge (VDO as well) that did the same thing.
Mine grounded to the block (actually, the heat exchanger it screws into) and used the G peg for signal, as yours seems to. It worked fine, the second time.
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 5:08 pm Post subject: Re: Oil pressure gauge pegs |
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| tencentlife wrote: |
| candyman wrote: |
| Not sure if this is a clue or not, with sender disconnected but gauge still grounded and 12v, it still pegs |
Then ground the sender wire to same ground point, if gauge goes to zero, all is well with the gauge.
Then remove sender and test resistance by itself, G-pin to nipple. It's probably a 10-180ohm sender, so going by the way VDO gauges respond (opposite of most built-in gauges) it should be 10 ohm at rest.
If sender has the idiot light function as well the W pin to nipple should be 0 ohm. |
Bingo! Thanks 10c, no resistance when testing sender by itself. G nor W. Bad sender :/ |
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tencentlife
Samba Member
Joined: May 02, 2006
Posts: 10078
Location: Abiquiu, NM, USA
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| Posted: Mon Apr 15, 2019 5:27 pm Post subject: Re: Oil pressure gauge pegs |
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| Quote: |
| no resistance when testing sender by itself. G nor W. Bad sender :/ |
No resistance as in zero ohms? If the sender was bad, as in open circuit, you would see infinite ohms. Is that what you meant?
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candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2694
Location: Missoula MT
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| Posted: Mon Apr 15, 2019 6:09 pm Post subject: Re: Oil pressure gauge pegs |
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| tencentlife wrote: |
| Quote: |
| no resistance when testing sender by itself. G nor W. Bad sender :/ |
No resistance as in zero ohms? If the sender was bad, as in open circuit, you would see infinite ohms. Is that what you meant? |
As in no change to resistance whatsoever ever with engine running. No ohms values at all, hot cold, engine on or off. I notice the sender body has some damage to it, like a soup can that get a dent in it, so this may be the cause |
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