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Originally Posted by s14kev
Well I just realized that fuses 6, 7, 8 and 9 are all interconnected at the top power feed so connecting the red 16Ga wire to run the fuel pump to the top of the fuse 9 is no different to connecting it to the top of fuse 6.
It also learned that 911SC's have a fuel pump that runs all the time when ignition is on even when the engine is not running unlike the 993 DME which only runs the pump when the engine is running. The PMS instructions say to disconnect the wire running to the fuel pump fuse and replace it with the 16Ga from the conversion harness. I'm guessing the original wire to run the fuel pump is still connected. Need to work out how to find this in the jumble of wiring left over since this car also has a classic retrofit fuse panel.
I pulled the PMS conversion harness to tidy it up since it uses sketchy electrical tape to bind it. I was going to sleeve it in the correct Porsche style black PVC tube. I did find this power transformer taped midway in the conversion harness spliced into the yellow wire that runs the tachometer. Any clues why someone put this there?
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Maybe a source for the Tach reference voltage