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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 08-03-2018, 05:28 PM   #1
johnnyhillen
 
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Electrical problem no power anywhere

hi

Ive rebuild most of my s14 over the last number of years and will hopefully soon be finished but i have ran into an electrical problem and im an idiot when it comes to auto electrics and no idea how to read wiring diagrams

atm the ecu loom is connected up and the loom to the fuse box is connected bar the section that runs along the front of the car to the lights etc. I connected up a charged battery to confirm everything was working and to get some lights on the dash for the first time in years but cannot get it to work. I first assumed it must be a grounding issue anf found a few small grounds that were not connected and connected them to the nearest bolt for now. Any of the grounds front the loom along the front of the car were grounded directly to the battery neg terminbal as that part of the loom was just sitting loose. the alternator bracket is off being powder coated so i connected up the alternator and ran a heavy cable from the housing to the engine block in lieu of the housing being bolted straight to the block. I have used an alternator and checked continuity for all the earths and they are all good. the big earth that goes to the fuse box only connects with the ignition turned on all the rest seem to be permanent. When checking voltage Im getting slightly over 12v across the battery terminals and the same checking the positive against any earth.

with all that it still doesnt work. when i connect the terminals im not getting that tiny spark you would normally expect and no sign of power to anything else.

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