Battery Reversal Accident, Need Guru help plz...

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BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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So the other night I decided to be stupid and change my battery in my dark garage while talking to friends... :slap: Big mistake. I reversed the battery cables, and by the time I realized what I did it was too late. Anyways, after I screwed everything up, I put the battery on the right way but nothing in the car worked, obviously. I checked all my fuses and the only ones I found that were blown were the 75A fuse under the hood for the alternator, and the 30A fuse for the Ign. switch. Promptly, I went to the local nissan dealership to replace the fuses, and got a new battery just in case. Today, I installed the new fuses and battery, and when I turned the key, only the lights and clock of the car work. Some random electronics too, such as the gauges (but not my boost controller and turbo timer) and the radiator fan (which I made a switch in the dash for myself).
The night that I reversed the battery, I searched the forums and what not for similar problems and tips, and found out I could have done anything from fry the ecu to fry a couple of wires. In many cases, it said the fuses were supposed to protect that from happening, but apparently it happened to me. I know a bunch of people who could hook me up with a new ecu, so that wouldn't be a problem, I just needed to know if any gurus on here might know a solution and/or what to look for.
My engine is a 96 blacktop SR20DET
Like I said, only the lights and clock work. I didn't hear the fuel pump turn on or any other electronic stuff.

Any help would be appriciated :confused: :sad:


BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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Oh, and I checked the fuses again after redoing everything, and the 30A fuse for the IGN SW blew out again....

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PyR0NiAk
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Joined: Sun Mar 01, 2009 4:29 pm
Car: S13 SR W/ T2 GT3071R .86AR, JWT S4 Cams, 810cc Injectors,Z32 MAF, JWT tuned ECU 87mm 9:1 Compression CP pistons, Manley Rods
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seems you did what I did when I installed my SR before removing all of my SOHC power steering stuff Just to a higher level.. I ended up having one of the metal lines touch the alternator. It fried the part of my ecu that activates the ground for the fuel pump. I ran a secondary ground as a temporary fix, and when I got my ecu back from JWT, they had fixed it. I'd lay money you have melted wires (the continuous blowing of the fuse says this..) AND a burnt ecu.

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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Where would I find the melted wires?

I have another ECU on the way from a friend with the same gen SR so I can can fix the ECU problem.

Thanks for the response!!!!! :gapteeth:

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PyR0NiAk
Posts: 3851
Joined: Sun Mar 01, 2009 4:29 pm
Car: S13 SR W/ T2 GT3071R .86AR, JWT S4 Cams, 810cc Injectors,Z32 MAF, JWT tuned ECU 87mm 9:1 Compression CP pistons, Manley Rods
Location: Ohio
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Start opening up that wiring harness... You'll find them pretty easily.

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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Thanks!

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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Does anybody have even the slightest idea of where these wires might be?
I've spent the last two days opening up the wiring harness around the blown fuse and coming from the ignition and found nothing.... :gotme

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snake240
Posts: 344
Joined: Thu Sep 25, 2008 4:16 pm
Car: 92 hatch SR20DET

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your really going to need to look at every bit of wiring over the whole engine and chassis harness. good luck

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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I got a new ECU, and I checked every inch of wire from the ignition to the IGN SW-fuse that keeps blowing and all the wires located in that harness and I've not found a single melted wire... Is there somewhere else I should be looking? The fuel pump doesn't start either, but all the electronics still work...

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USMCgetsome
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Car: OWN S13.5 RB25DET/2003 G35
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start probing for signals out of the ecu. pulse signals to the fuel pump, injectors, igniter and so on!

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USMCgetsome
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Something else too look at. Check in the relay box where the fuse is. Look for damage. Your next step after that is to break out the wiring diagrams and see what
Else taps into
That fuse.

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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Checked the relay box and no damage, checking the wiring diagrams today...

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PyR0NiAk
Posts: 3851
Joined: Sun Mar 01, 2009 4:29 pm
Car: S13 SR W/ T2 GT3071R .86AR, JWT S4 Cams, 810cc Injectors,Z32 MAF, JWT tuned ECU 87mm 9:1 Compression CP pistons, Manley Rods
Location: Ohio
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Got a friend with a different alternator you could test out?

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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So I searched through the harness, and found the wire coming from the ignition switch that had melted. I fixed it, and once everything was back in place I tired starting the engine. It cranked but I noticed the fuel pump didn't come on, so I disconnected everything and found what was wrong with the fuel pump and fixed it, but when I put everything back together, nothing worked. The engine wouldnt turn and most of the electronics don't come on anymore. The only things that work are the trunk light and the headlights... :confused:

Sugar
Posts: 160
Joined: Wed Jun 30, 2010 12:01 pm
Car: S13 w/ Sr

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Most likely another short somewhere, check to make sure that wire you replaced is still good.

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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Checked the harness again and found no melted wires. Did I burn the ecu again? All the fuses are intact, maybe a relay...?

BlacktopturboSX
Posts: 27
Joined: Mon Apr 30, 2007 6:49 am
Car: S13 Nissan Silvia

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ECU turned out to be okay, tested my friends ecu from his perfectly working SR and it had the same result...


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