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Must be the old age thing.=C2=A0 After I sent my previous note, I got to t=
hinking, "What might I have affected when I changed the alternator, that wo=
uld cause this loss of oil pressure on the gauge".=C2=A0 OK, I did disconne=
ct the wire going to the oil pressure sending unit, but I labeled it with m=
asking tape before I removed it.=C2=A0 Maybe a loose connection? I checked =
the connection - it was OK.=C2=A0 So, if all else fails, read the manual - =
right?=C2=A0 The wiring diagram in the manual showed a white wire with a br=
own tracer going to the sending unit.=C2=A0 The wire I had going to the sen=
ding unit was white with a black tracer.=C2=A0 However, there was a white w=
ire with a brown tracer coming from the wiring harness, but it had been tap=
ed back by a previous owner, and was not used.=C2=A0 So, what the heck, I t=
ried the white/brown wire and the gauge worked.
The mystery is that I am almost 100% sure the wire I removed from the sendi=
ng unit was the white/black wire.=C2=A0 Not only did I label it before I to=
ok it off, but that wire had a plastic shield around it, like heat shrink t=
ubing, except it was loose on the wire, and the other wire didn't.=C2=A0 Bo=
th of these things make me certain the white/black wire is the one I remove=
d.=C2=A0 Why then, after replacing the alternator, the oil pressure gauge d=
id not work, but after switching to the white/brown wire, it did?=C2=A0 Sin=
ce the wire that was attached to the sending unit (white/black) did not agr=
ee with the wiring diagram, I can only assume that a previous owner put the=
wrong wire on it.=C2=A0 But then, why did the gauge work with the wrong wi=
re on it?=C2=A0 When I discovered the correct wire, which had been taped ba=
ck, out of use, and hooked it to the sending unit, the gauge worked.
Any ideas of what caused this mystery?=C2=A0 Thanks.
Jack
----- Forwarded Message ----- From: Jack Wheeler <jwheeler1947@yahoo.com=
>To: Mglist <mgs@autox.team.net>Sent: Tuesday, December 4, 2018, 3:15:17 PM=
ESTSubject: Another Technical Question
If it's not one thing, it's another.=C2=A0 I just got my new (rebuilt) alt=
ernator installed on my 1971 MGB yesterday, and I have a used door latch on=
the way.=C2=A0 This morning I started up the car and waited for the oil pr=
essure gauge to come up, as I always do.=C2=A0 But after a few seconds, no =
oil pressure.=C2=A0 I checked to see that the sump was full - it was.=C2=A0=
Since I have had good oil pressure all along, I have to believe it has som=
ething to do with the gauge.=C2=A0 I checked all the fuses, and they were a=
ll good.
Has anyone had a similar problem, or does anyone have any suggestions where=
I should look for a solution?=C2=A0 I intend to pull the hose off the oil =
cooler and crank it over, just to make sure it really does have pressure, b=
ut I'm 99% sure that there is pressure - just not showing up on the gauge.
Thanks for your help.
Jack Wheeler
=20
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<html><head></head><body><div></div>
<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 alterna=
tor, 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 label=
ed 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 t=
he manual - right? The wiring diagram in the manual showed a white wi=
re with a brown tracer going to the sending unit. The wire I had goin=
g to the sending unit was white with a black tracer. However, there w=
as 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 t=
he 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 b=
efore I took it off, but that wire had a plastic shield around it, like hea=
t 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 on=
e I removed. Why then, after replacing the alternator, the oil pressu=
re 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) d=
id not agree with the wiring diagram, I can only assume that a previous own=
er put the wrong wire on it. But then, why did the gauge work with th=
e wrong wire on it? When I discovered the correct wire, which had bee=
n taped back, out of use, and hooked it to the sending unit, the gauge work=
ed.</div><div><br></div><div>Any ideas of what caused this mystery? T=
hanks.</div><div><br></div><div>Jack<br></div><div><br></div>
=20
<div id=3D"ydp71d219f1yahoo_quoted_4571749444" class=3D"ydp71d219f1=
yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
<div>----- Forwarded Message -----</div>
<div><b>From:</b> Jack Wheeler <jwheeler1947@yahoo.com&g=
t;</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> A=
nother Technical Question</div><div><br></div>
<div><div class=3D"ydpf67c197eyahoo-style-wrap" style=3D"fo=
nt-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) alterna=
tor 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 pressu=
re 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. Sin=
ce I have had good oil pressure all along, I have to believe it has somethi=
ng to do with the gauge. I checked all the fuses, and they were all g=
ood.</div><div class=3D"ydpf67c197eyahoo-style-wrap" style=3D"font-family:H=
elvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><br></div><div=
class=3D"ydpf67c197eyahoo-style-wrap" style=3D"font-family:Helvetica Neue,=
Helvetica, Arial, sans-serif;font-size:13px;">Has anyone had a similar pro=
blem, or does anyone have any suggestions where I should look for a solutio=
n? I intend to pull the hose off the oil cooler and crank it over, ju=
st to make sure it really does have pressure, but I'm 99% sure that there i=
s pressure - just not showing up on the gauge.</div><div class=3D"ydpf67c19=
7eyahoo-style-wrap" style=3D"font-family:Helvetica Neue, Helvetica, Arial, =
sans-serif;font-size:13px;"><br></div><div class=3D"ydpf67c197eyahoo-style-=
wrap" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;fon=
t-size:13px;">Thanks for your help.</div><div class=3D"ydpf67c197eyahoo-sty=
le-wrap" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;=
font-size:13px;"><br></div><div class=3D"ydpf67c197eyahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;">Jack Wheeler<br></div></div>
</div>
</div></body></html>
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