TwinTurbo.NET: Nissan 300ZX forum - Definitely check for shorts and grounds, but specifically
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Subject Definitely check for shorts and grounds, but specifically
     
Posted by CoHPhasor on March 15, 2011 at 5:11 PM
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In Reply To LTG Fuse and smoking PTU Problem posted by scottacc on March 13, 2011 at 04:00 PM
     
Message check the ground points at the back of the plenum.

There is a ground for the PTU back there, and forgetting to connect it will definitely toast your PTU.

If you can't find any obvious shorts, and you've verified the grounds, you'll need to measure all the ECU wires for shorts.
(PITA)

5A is high draw BTW. I usually hear of that kind of draw when the alt's diodes fail.

     
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