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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,575
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The red/white wire in the engine harness turns ON when you turn the ignition switch to the Ignition position. Thus, it's on when the engine is not running. Your first idea, to wire it to the fuel pump, or the output of the fuel pump relay (pin 30), is the way to go. In the SC models, the pump only runs when the engine is cranking or running. IIRC, your 1976 works the same way. No need to power the O2 sensor through another relay, as the current draw of the o2 sensor is small, relative to the full pump. The fuel pump fuse is around 25 amps, but the pump draws about 10 amps or less.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 08-08-2025 at 11:29 PM..
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