73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: Tazman on December 05, 2016, 04:50:09 pm
-
I do not know how many out there are running stock gauges but I am preparing to go back to them. Right now I have mechanical ones under the dash and I want to clean things up. I know I need to change the sending units for both the oil and coolant. My questions are this what color will the wire be that goes to the oil sending unit? Also what else will I need besides the sending unit? I have new gauges and the circuit board is just two years old.
Thanks
-
Assuming it's the 1987 in your signature.
The oil gauge sender wire is Tan. There should be an oil pressure switch for the fuel pump as well.
-
Great I will look for that tan wire, as for the fuel pump that gauge has always worked great. So hooking that wire to the oil sending unit the gauge should work?
Thanks,
-
Assuming it's the 1987 in your signature.
The oil gauge sender wire is Tan. There should be an oil pressure switch for the fuel pump as well.
on my 91 i have 3 wires into the oil pressure switch. orange (fuel pump relay) gray (for the ecm) and tan (for the gauge).
-
In looking for that tan wire I have a female plug coming from the top of the coil. It has a red wire and a tan wire going to it. The red one goes from there to the back of the distributor, the tan stops with the plug. That is the only tan wire I have found so far. This will be coming from the firewall correct?
-
Look down by the oil filter.
-
Look down by the oil filter.
I just did, is that the other sending unit? Does that wire go to the other sending unit by the distributor? Does one go to the ECM?
Thanks
-
The oil pressure gauge "sender" has only one terminal, appears similar to the image below, and should be located down by the oil filter. The two-wire oil "switch" located adjacent to the distributor is the failsafe backup for the fuel pump.
-
I have a mechanical sender now and the line goes to the unit by the distributor down and into the cab to the gauge. So that is supposed to be the backup?
-
the two wire one will look like (http://s7d9.scene7.com//is/image/GenuinePartsCompany/50943?$thumb$) the oem one will be a couple inches longer but the same idea. they just changed the design within the past year. but this one is the back up
-
http://www.oreillyauto.com/site/c/detail/ACD0/D1838/03438.oap?year=1987&make=Chevrolet&model=R10%2BPickup%2BRWD&vi=5002896&ck=Search_oil+pressure+sensor%21s%21switch_5002896_3645&keyword=oil+pressure+sensor%21s%21switch#
Won't this work?
-
the two wire one will look like (http://s7d9.scene7.com//is/image/GenuinePartsCompany/50943?$thumb$) the oem one will be a couple inches longer but the same idea. they just changed the design within the past year. but this one is the back up
The wires from the sensor by the oil filter go to the ECM or the gauge?
Thanks
-
it says 2 wires but theres 3. its my only oil sensor and my gauges work and my fuel pump replay work. the only thing not hooked up is the ecm but that gray wire just got cut
-
Well I just found the wire buried and in need of cleaning. I see two wires with a plug type that will not work with the sensor you last showed me. I do not think the one I showed will work either. At least I have the wire.
-
1987 TBI had one oil pressure "switch"...
(http://s7d9.scene7.com//is/image/GenuinePartsCompany/50943?$thumb$)
...adjacent to the distributor for fuel pump backup power (orange wire connected to fused B+ and tan/white wire connected to fuel pump & ECM)...
...and one oil pressure "sender"...
(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=34110.0;attach=46959;image)
...located directly above the engine oil filter for the factory oil pressure gauge (single tan wire).
The two oil pressure sensors (switch and sender) operate independently and are electrically isolated from one another.
The switch that you linked...
http://www.oreillyauto.com/site/c/detail/ACD0/D1838/03438.oap?year=1987&make=Chevrolet&model=R10%2BPickup%2BRWD&vi=5002896&ck=Search_oil+pressure+sensor%21s%21switch_5002896_3645&keyword=oil+pressure+sensor%21s%21switch#
Won't this work?
...is for a dash low oil pressure telltale and will not work for a gauge.
-
i was mistaken. im so used to parts stores computers not be able to tell a 91 v3500 from a 91 k3500 i always take it back to 87. the 91 does have a different switch.
(http://contentinfo.autozone.com/znetcs/product-info/en/US/wl2/PS220/image/3/)
this appears to have changed from the 87 style in 89 sorry in my information confused you
-
After cleaning it, it has a tan wire and a red wire but the end will not work. Can this work by using only the tan wire?
Thanks
-
Post a pic.
-
Sorry I can not do that but I can tell you this. After hooking everything up no she won't start, I checked the plugs twice they are fine. I think that wire is not the oil wire.
-
Sorry but this why I could not do a picture. This the plug that I removed.
-
That "impressionist art" looks like the brown connector for the fuel pump relay bypass switch (one orange wire and one tan w/white stripe wire). The tan/white wire from that connector runs to the fuel pump and ECM. It has nothing to do with the gauge. The single tan sender wire for the gauge should be in the vicinity of the oil filter.
-
So hooking the tan/white wire to the oil sender should have no affect on anything? I did take it back off but the truck still will not fire.
Thanks
-
DO NOT CUT ANY MORE CONNECTORS OFF. It's counterproductive.
This is the drawing from the 1985-1991 parts book showing where these engine senders are located on the 1987 LO5 & LO3 V8
(http://johnnynightstick.s3.amazonaws.com/IMAGES/LO5Sensors.jpg)
The GM 10069218 gauge sender is just above the oil filter See number 25 in the above parts book drawing. Number 9 would be in the same location for a base model warning lamp dash.
(https://i5.walmartimages.com/asr/565a4b4a-5286-4172-992c-568e5c48140f_1.ad6df85a7989790e777c81796a87aba7.jpeg)
The GM 25036938 TBI Fuel Pump Oil Pressure Switch is number 22 in the above drawing near the distributor.
(http://s7d9.scene7.com//is/image/GenuinePartsCompany/50943?$thumb$)(http://johnnynightstick.s3.amazonaws.com/IMAGES/25036938.jpg)
Don't throw out the plug you cut off it's OBSOLETE and you can re-use the shell. If you threw it out you'll get to scrounge one off a donor.
The part # is Delphi 12052384. Get a wiring guru with the proper tooling, if that's not you, to extract the terminals from your plug, install new Delphi Metripack 150 or 280 terminals & wire seals on 8" sections of 16ga SXL wire, then insert the new terminals into the connector making it a repair pigtail. They can then solder or crimp and heatshrink the pigtail to the cut off wires on your harness.
The Obsoloete plug should look similar to one of these.
(http://johnnynightstick.s3.amazonaws.com/IMAGES/pt121-12085499.jpg)(http://johnnynightstick.s3.amazonaws.com/IMAGES/pt606-12125695.jpg)
-
I did not throw away the plug, but it was not being used at the time, I do not see where it was to be plugged into. When I found it I was looking for the plug for number 22,I hope to find it yet. Is the drawing you show on line?
Great information!!
Thanks
-
I did not throw away the plug, but it was not being used at the time, I do not see where it was to be plugged into. When I found it I was looking for the plug for number 22,I hope to find it yet. Is the drawing you show on line?
Great information!!
Thanks
You can download the GM parts books from the Mediafire link in my signature.
The drawing is from the 1985-1991 Illustration book.
The 5.0L LO3 is on the lower left of PDF page 132
The 5.7L LO5 is on the upper right of PDF page 136
-
Found a blown fuse so she is back to running fine. Still need to find that wire, plan to start near the filter and work my way up.
Thanks again !!
-
DO NOT CUT ANY MORE CONNECTORS OFF. It's counterproductive.
This is the drawing from the 1985-1991 parts book showing where these engine senders are located on the 1987 LO5 & LO3 V8
(http://johnnynightstick.s3.amazonaws.com/IMAGES/LO5Sensors.jpg)
The GM 10069218 gauge sender is just above the oil filter See number 25 in the above parts book drawing. Number 9 would be in the same location for a base model warning lamp dash.
(https://i5.walmartimages.com/asr/565a4b4a-5286-4172-992c-568e5c48140f_1.ad6df85a7989790e777c81796a87aba7.jpeg)
The GM 25036938 TBI Fuel Pump Oil Pressure Switch is number 22 in the above drawing near the distributor.
(http://s7d9.scene7.com//is/image/GenuinePartsCompany/50943?$thumb$)(http://johnnynightstick.s3.amazonaws.com/IMAGES/25036938.jpg)
Don't throw out the plug you cut off it's OBSOLETE and you can re-use the shell. If you threw it out you'll get to scrounge one off a donor.
The part # is Delphi 12052384. Get a wiring guru with the proper tooling, if that's not you, to extract the terminals from your plug, install new Delphi Metripack 150 or 280 terminals & wire seals on 8" sections of 16ga SXL wire, then insert the new terminals into the connector making it a repair pigtail. They can then solder or crimp and heatshrink the pigtail to the cut off wires on your harness.
The Obsoloete plug should look similar to one of these.
(http://johnnynightstick.s3.amazonaws.com/IMAGES/pt121-12085499.jpg)(http://johnnynightstick.s3.amazonaws.com/IMAGES/pt606-12125695.jpg)
I just learned from another post that the wire I cut is from the stock sending which is what I want to use. How hard is it to attach a new plug?
-
I replaced the plug hooked it up and bought a new switch looks like I need to replace the gauge sending unit also because nothing works yet.
DO NOT CUT ANY MORE CONNECTORS OFF. It's counterproductive.
This is the drawing from the 1985-1991 parts book showing where these engine senders are located on the 1987 LO5 & LO3 V8
(http://johnnynightstick.s3.amazonaws.com/IMAGES/LO5Sensors.jpg)
The GM 10069218 gauge sender is just above the oil filter See number 25 in the above parts book drawing. Number 9 would be in the same location for a base model warning lamp dash.
(https://i5.walmartimages.com/asr/565a4b4a-5286-4172-992c-568e5c48140f_1.ad6df85a7989790e777c81796a87aba7.jpeg)
The GM 25036938 TBI Fuel Pump Oil Pressure Switch is number 22 in the above drawing near the distributor.
(http://s7d9.scene7.com//is/image/GenuinePartsCompany/50943?$thumb$)(http://johnnynightstick.s3.amazonaws.com/IMAGES/25036938.jpg)
Don't throw out the plug you cut off it's OBSOLETE and you can re-use the shell. If you threw it out you'll get to scrounge one off a donor.
The part # is Delphi 12052384. Get a wiring guru with the proper tooling, if that's not you, to extract the terminals from your plug, install new Delphi Metripack 150 or 280 terminals & wire seals on 8" sections of 16ga SXL wire, then insert the new terminals into the connector making it a repair pigtail. They can then solder or crimp and heatshrink the pigtail to the cut off wires on your harness.
The Obsoloete plug should look similar to one of these.
(http://johnnynightstick.s3.amazonaws.com/IMAGES/pt121-12085499.jpg)(http://johnnynightstick.s3.amazonaws.com/IMAGES/pt606-12125695.jpg)
-
Great day !! The oil gauge is now working and all is well. With the temp and oil gauges working now the amp gauge is left. Hopefully it will be easier than the oil was.
Thanks !!!
-
Could not get the volt gauge working so I did some searching on this forum and found I might have the two clips in the wrong spot. Changed it and now it works great! I did find that the temp gauge goes all the way to the right, I need that fixed now and my interior will be done.
Happy New Year !!
-
Nailing the temp gauge to the right means the temp sensor wire is shorted or the temp sensor is failed dead shorted.