smknram
"ADICTED"
- Joined
- Sep 13, 2007
- Messages
- 187
So a few days ago I started my truck to let it warm up, made a quick glance at all the gauges as I do at each start up, everything checked out good. It idled for 10 mins or so then I went a mile to the store (idled a couple mins while I was in the store) then about half way back to the house, I look down and oil pressure is at 0. I continued on to the house and did a quick look over, oil level was full and all the wiring on the gauge and sending unit looked good.
I have not had time to investigate anything until this evening which was 40 mph wind and blowing snow (I'm kind of afraid to drive it to the shop where I can be in the heat and have good lighting until I know for sure it actually has oil pressure) so my time spent was limited. The gauge is an Autometer Sport-Comp Ultra Lite, short sweep, electronic gauge. I was able to check voltage, in which it is getting 12v to the gauge and sending 9v to the sending unit which seems right to me. I checked continuity on the sending unit to ground, which was good. I ohms from sending unit stud to ground before starting truck and got 65 Ohms, then after starting the truck the meter showed open circuit. I shut the truck off and checked again and got 74 Ohms. I'm using a Fluke 323 meter which is auto ranging but I'm not sure on the ohms range of the meter to know if I can trust the "open circuit" when running.
Does anyone know what the Ohms readings should be when running and when off? Is there any simple tests to do with the gauge and/or sending unit to check them? Id really like to think I really do have oil pressure but hate to just start throwing parts at it to figure it out.
Sorry for the long post, I just wanted to get all the information in here that I could to assist in diagnosing the problem.
I have not had time to investigate anything until this evening which was 40 mph wind and blowing snow (I'm kind of afraid to drive it to the shop where I can be in the heat and have good lighting until I know for sure it actually has oil pressure) so my time spent was limited. The gauge is an Autometer Sport-Comp Ultra Lite, short sweep, electronic gauge. I was able to check voltage, in which it is getting 12v to the gauge and sending 9v to the sending unit which seems right to me. I checked continuity on the sending unit to ground, which was good. I ohms from sending unit stud to ground before starting truck and got 65 Ohms, then after starting the truck the meter showed open circuit. I shut the truck off and checked again and got 74 Ohms. I'm using a Fluke 323 meter which is auto ranging but I'm not sure on the ohms range of the meter to know if I can trust the "open circuit" when running.
Does anyone know what the Ohms readings should be when running and when off? Is there any simple tests to do with the gauge and/or sending unit to check them? Id really like to think I really do have oil pressure but hate to just start throwing parts at it to figure it out.
Sorry for the long post, I just wanted to get all the information in here that I could to assist in diagnosing the problem.
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