Walt:
I just went through the same thing, and the answer is "no", you
should not get 0 ohms with it sitting on your workbench. I am not
sure what the reasoning is, but you only get 0 in a fairly narrow pressure
range.
I am guessing that the oil pressure warning indicator is
energized at all times, and if you were to have 0 ohms with no
pressure, the oil warning would glow even when the key is not
in the ignition. Likewise for the anti-run-on valve (if you have one) -
it would be energized even with the car turned off.
I, too, bought a new switch, for exactly the same reason. Sigh.
My investigation started when I attempted to hook the anti-run-on
solenoid back up, after the PO had removed it and the charcoal canister.
The solenoid was energized all the time, so I thought my switch was
bad. Bought a new one, same thing. Turned out the PO had buggered the
wiring and gotten a couple of wires swapped. Swapped the wires back,
and both the old and new oil pressure switches worked just fine.
Ciao,
Vance
------------------------------
1974 Mimosa Yellow Triumph TR6
Cogito Ergo Zoom
(I think, therefore I go fast)
-----Original Message-----
From: Walt Philipson [mailto:wphilipson@bigfoot.com]
Sent: Tuesday, September 10, 2002 2:29 PM
To: 6 - Pack
Subject: oil pressure switch
Ok,
My oil pressure lamp, brake lamp, and gulp valve aren't working. I think I
traced it to a bad oil pressure switch. I may be making a bad assumption
here, but I wanted to check (I know, I need to get Dan's electrical book).
>From the wiring diagram, (At the oil pressure switch) I thought I should get
continuity between terminals "p" and "s" with the engine off, and "p" and
"i" with the engine running. I got neither, so I assumed the switch was bad.
I purchased a new switch. Before I installed it I wanted to check it out. I
checked "P" and "S" and got no continuity. I then held a hand pump to the
switch, pressurized it and measured 0 ohms between "P" and "I" as expected.
Am I missing something or is the new switch bad? Shouldn't I get 0 ohms
between "P" and "S" with it sitting on my workbench?
Walt Philipson
74 Carmine
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