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<div>Must be the old age thing. After I sent my previous note, I got to thinking, "What might I have affected when I changed the alternator, that would cause this loss of oil pressure on the gauge". OK, I did disconnect the wire going to the oil pressure sending unit, but I labeled it with masking tape before I removed it. Maybe a loose connection? I checked the connection - it was OK. So, if all else fails, read the manual - right? The wiring diagram in the manual showed a white wire with a brown tracer going to the sending unit. The wire I had going to the sending unit was white with a black tracer. However, there was a white wire with a brown tracer coming from the wiring harness, but it had been taped back by a previous owner, and was not used. So, what the heck, I tried the white/brown wire and the gauge worked.</div><div><br></div><div>The mystery is that I am almost 100% sure the wire I removed from the sending unit was the white/black wire. Not only did I label it before I took it off, but that wire had a plastic shield around it, like heat shrink tubing, except it was loose on the wire, and the other wire didn't. Both of these things make me certain the white/black wire is the one I removed. Why then, after replacing the alternator, the oil pressure gauge did not work, but after switching to the white/brown wire, it did? Since the wire that was attached to the sending unit (white/black) did not agree with the wiring diagram, I can only assume that a previous owner put the wrong wire on it. But then, why did the gauge work with the wrong wire on it? When I discovered the correct wire, which had been taped back, out of use, and hooked it to the sending unit, the gauge worked.</div><div><br></div><div>Any ideas of what caused this mystery? Thanks.</div><div><br></div><div>Jack<br></div><div><br></div>
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<div><b>From:</b> Jack Wheeler <jwheeler1947@yahoo.com></div><div><b>To:</b> Mglist <mgs@autox.team.net></div><div><b>Sent:</b> Tuesday, December 4, 2018, 3:15:17 PM EST</div><div><b>Subject:</b> Another Technical Question</div><div><br></div>
<div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">If it's not one thing, it's another. I just got my new (rebuilt) alternator installed on my 1971 MGB yesterday, and I have a used door latch on the way. This morning I started up the car and waited for the oil pressure gauge to come up, as I always do. But after a few seconds, no oil pressure. I checked to see that the sump was full - it was. Since I have had good oil pressure all along, I have to believe it has something to do with the gauge. I checked all the fuses, and they were all good.</div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><br></div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">Has anyone had a similar problem, or does anyone have any suggestions where I should look for a solution? I intend to pull the hose off the oil cooler and crank it over, just to make sure it really does have pressure, but I'm 99% sure that there is pressure - just not showing up on the gauge.</div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><br></div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">Thanks for your help.</div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><br></div><div class="ydpf67c197eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">Jack Wheeler<br></div></div>
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