Major Electrical problem

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long shot
Posts: 80
Joined: Wed Apr 30, 2008 4:49 am
Car: 89 240sx fastback

Post

Alright so I ran into a major electrical problem tonight. I went to test the ignition wires to double check the color code since i was planning on doing a starter kill and I have no power going to the ignition harness.

Here's a bit of an overview of what i've done prior. (battery out) A few days ago I removed my dash, dropped the steering column, and put in a radio-(new wiring with power coming off of ignition constant) after installing the radio I turned it on (separate switch instead of accessory) and it worked fine and I let it run for about an hour.

Until tonight I have not touched the car. Tonight I installed my new headlights and ran my wires for my angel eyes and city lights (only grounded them no +12v yet) then I had planned to do the starter kill so I pulled up the color codes online and went out to voltage test the ignition to double check them. When I went to check them I wasn't reading any voltage from the 12v constant. So I double checked my battery connections (fine), fuses (fine), and fusible links (fine) then I checked the battery side of the fuse box and It read 12v.EDIT: The reason i tested the ignition harness was to verify my colorsWhite/Red- 12vBlue- Acc.Black/yellow- ?Black/green- ?Black/red- ?These don't match any manual or color codes I have looked at for the vehicle

So as a thought I set my meter to continuity and hooked one end to ground and started testing the ign. harness and all the leads had continuity to ground (I know that is not a good thing). right now the only thing that does work on my car are all the lights; dome, headlights, parking, tail, and break lights. I did blow a fuse on the tail lights but replaced that and they were fine. And that brings you guys up to speed as to where I am right now.

I am now out of ideas and at a loss as to what the problem is and frankly i'm pretty pissed since i'll be getting my new engine in a few days (old one not pulled yet). If any one has any ideas I would greatly appreciate the help on this one.
Modified by long shot at 7:48 PM 10/27/2008


long shot
Posts: 80
Joined: Wed Apr 30, 2008 4:49 am
Car: 89 240sx fastback

Post

Well today when I got home from my classes I said f**k the electrical problem maybe it would solve itself and I put my bash back on. After pulling all my harnesses through their respective holes I felt like a complete idiot. Apparently I never noticed that the rear defrost and the ignition wires have the same style socket. The whole time I have had my ignition hooked up to my defroster. Any ways all things are good now n just thought i'd let you guys know in case anyone else ever runs into this problem.

Vegascorbin
Posts: 732
Joined: Sat Nov 24, 2007 9:56 am
Car: 1990 240sx dirt track race car

Post

Not sure I can help much as my race car doesn't have a dash but here goes.

First guess. A connector that you disconnected along the way did not get connected properly when you put it back and came loose over the days.

Does the radio still work? I would work backwards through your changes and see if you cut something by mistake or blew a fuse with out realizing it.

As for the wire colors, be aware that Japannse companies will sometimes use terms like Sky or Grass for differant shades of blue or green. It doesn't matter the color aslong as the size is correct and it connects to the proper places. Does make it a P.I.A. to troubleshoot though.


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