the alfa is fixed

"aberson Bresident of the FullyAssed Committe" (emaxxbl) 08/07/2019 at 21:10 • Filed to: None

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My timesert kit came a day early and with minimal fuss I now have two M8x1.25 threads in my cylinder head to hold the exhaust camshaft in place.

But now I have a new dilemma, I got about half a mile into my test drive when the dashboard was engulfed in smoke and the acidic smell of burnt wiring. It appears my autometer phantom 2 wideband gauge I installed quite some time ago tried to kill itself because the 12v positive wire got hot enough to melt the insulation clean off of it. The wire itself is perfectly fine and I don’t see any arc spots under the dash so I don’t it got chaffed enough to short out against anything and I don’t think my power source (the ignition switch) is the issue because I’m pulling power for the voltage gauge from the exact same spot with no problems . It’s possible the gauge itself has a short in it but I’m not entirely convinced it does because I had the alfa idling in my garage for about 4 minutes without issue, yet a half mile of driving and the gauge goes kaput. Maybe it took that long for the wire to get hot enough to melt but I’m not sure about that because it’s a tiny 20 gauge wire. I’m almost convinced it’s something along the lines of a failing voltage regulator messing with the car.

MM54 > aberson Bresident of the FullyAssed Committe 08/07/2019 at 21:24

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No fuse?

Does that same power feed run the sensor itself, or just a gauge? I could imagine if the sensor or its wiring failed it would overcurrent the supply. O2 sensors have decent power demands, since they’re heated.

aberson Bresident of the FullyAssed Committe > MM54 08/07/2019 at 22:00

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that does sound like a possibility since there’s only one 12v source wire for the whole thing.

MiniGTI - now with XJ6 > aberson Bresident of the FullyAssed Committe 08/07/2019 at 23:20

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+12v wire in question should be  fused as close to its source as possible appropriate to the AWG.