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<p class="MsoNormal">Doing an electric fuel pump?</p>
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<p class="MsoNormal">My understanding of these switches with those letter labels is that I is ignition, S is starter, and P is power output (to a relay). <a href="http://www.how-to-build-hotrods.com/electric-fuel-pump.html">http://www.how-to-build-hotrods.com/electric-fuel-pump.html</a></p>
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<p class="MsoNormal">In terms of the switch function, for an oil pressure switch where ‘normal’ is 0psi I = Normally open, S = Normally closed, and P is common. E.g.,
<a href="http://documents.holley.com/199r9680-1rev.pdf">http://documents.holley.com/199r9680-1rev.pdf</a>. This allows the starter circuit to power the fuel pump before oil pressure builds and closes the oil pressure switch, when power to the pump switches
to the ignition circuit. </p>
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<p class="MsoNormal">Can’t help with wire colors for your harness.</p>
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<p class="MsoNormal">Cliff</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Triumphs <triumphs-bounces@autox.team.net> on behalf of James Mague <harrymague@aol.com><br>
<b>Sent:</b> Tuesday, May 29, 2018 3:12:31 PM<br>
<b>To:</b> triumphs@autox.team.net<br>
<b>Subject:</b> [TR] Oil Pressure Switch Wiring</font>
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<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">I am trying to figure out the wiring diagram for an oil pressure switch. There are three electrical connection labeled: P, S, and I.<br>
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<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">I have two wiring diagrams that conflict and I have some hand written notes that conflict with Dan Masters book. This is what I have on
the car: P--Black, S--White/Brown and I--White/Purple.</span></div>
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<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">Anybody have the correct way to wire the switch??</span></div>
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<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">Thanks</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">Harry M</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">74 TR6</span></div>
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