Hi, I've been trying to figure out why my car trips a ABS + Charging light. Alternator bench tested ok, battery is new, grounds are all good. All fuses are good. Now here's where it gets confusing, the helms test that I did indicates that I have a short somewhere in my blk/yel wire from alternator to wherever it goes (found out it goes to underdash fuse #23). from my understanding blk w/ yel stripe wires normally carry voltage, so I checked for resistance from the connector blk/yel to ground and got around 60-65 ohms, now it shouldn't be showing anything at all. I traced the wire back in the engine harness and unplugged it (engine harness) from the chassis/dash harness. Now when I check the connector (alternator), I get no open. I check the dash/chassis side of the plug (blk/yel) and I get 60-65 ohms. What I'm trying to figure out is if anyone has a wiring schematic of that part of the harness, so I can try and figure out where this wire goes. Its the blk/yel wire on the blue connector off the chassis/dash harness (if that helps). The helms doesn't really help me much as far as wiring goes =/. Thanks for any help.

 

Have you tried checking continuity with the fuse out, check from the connector to the fuse terminal on that side, then check the other side. Or is that what you've already done?

I'll try and take a look for you this weekend, I have an entire dash harness out of the car.

 

thanks, i'll try check w/ that fuse later today. this is really annoying.

 

Well, I was checking over everything earlier... checked from blk/yel @ the alternator connector to C131 (that's the "deadplug" on the pass. side of the bay). No shorts, check from that deadplug to the engine harness->chassis harness (blue plug), no shorts. Now before I was checking the chassis harness plug to see if it was grounding out, and it was. Checked it today, moved wires, etc... nothing... it "fixed" itslef??? I found the path of that blk/blue wire (looked @ a few schematics earlier).

alternator connector, c131 (deadplug), shocktower connector (blue), merges with a blk/yellow going to underhood fusebox for ELD, then goes to driver's footwell fusebox leading to fuse #23 (srs). The wire also goes to the cluster subharness from the dash fusebox.

I was trying to check if pulling fuse#23 had any effect (see if there was a short after the fuse), but since checking it earlier I found no shorts in that circuit anymore .

I fired the car up and the alternator is putting out 14.5-ish volts everywhere I check, that blk/yellow wire is getting 13.5 volts (thought it should be 12v dc?). The ABS and Charging light are still on, which is bugging me out, I wanna drive the car but I'm not going to untill this issue gets resolved.

Quick ? about the underhood fusebox, can having the 2 wires (battery and alternator) switched cause a problem? I'm pretty sure I have them right (battery+ on left, alternator+ on right, w/ the fusebox in the stock position).

 

IIRC you have the wires correctly into the fusebox.

14.5v is a bit high, I normally get around 13.8v. Admittedly, I'm not extremely familiar with the charging system, but I *believe* that the voltage regulator is inside the alternator, and that could be at fault.

The wire housing may just be broken somewhere, and you're getting an intermittent short, or maybe the ELD is bad, maybe the alternator is bad....geez.

I'm gonna take a look in the helms for a minute, I'll be back.

 

Ok at first glance, 14.5v is fine. Lemme look some more.

 

 

The last page is just testing the alternator internally, if you get there, I'll post it, but it would probably be easier to just get another one on here.