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Just got my LS6 up and running using MS3Pro and the DIYAutoTune drop on LSx 24 harness. From the harness, there is 1 wire that goes to the alternator to activate a low charging light. That's the only wire on the plug. The alternator I got reman from RockAuto (98-02 Camaro) was tested fine at AutoZone. The alternator will not charge. I have the hot lug run back to a fuse block where all the large gauge wires centralize from the battery. I tried running a wire from the 'sense' pin on the alternator back to the fuse block so the system has 'reference' voltage, but that didn't work either. The 4 pins on my alternator plug are 1) Phase, 2) Indicator lamp, 3) Ignition, and 4) Sense. The DIY harness was rigged to the Indicator lamp, and as stated, I tried running a Sense wire to my fuse block. I am currently researching, but not coming up with much. I am not quite sure what I'm missing here. Anybody have any ideas?

Hi everyone, I've been getting some advice in the build thread I've got going but figured this would be the better place to chase after the issues I'm having since it's more technical and a better setting to get pointers of what to look for. So the background: 1976 280z with an 11/75 build date if it matters. Effectively stock, save for a few minor things and an L28ET. A couple issues that are electrical-related: 1) The system does not seem to be charging. Charge light was off with the car running. I ran the engine for a bit and noticed the fuel pump kept getting louder and the engine running rougher so I turned it off and found that the battery read ~11.3 volts. Checked the wiring at the alternator and it checked out so I started the car again and tested voltage at the battery and the alternator positive post. Both read ~11.3 volts. Had the alternator and battery both tested at O'reilly on their machine and it said it checks out, though I know that isn't a final judgement on whether or not an alternator is really working properly or not. By that point I had assumed it was the voltage regulator. Replacements aren't easy to get and they're either expensive or the shipping costs more than the unit. By the time that would all be said and done I figured I would be better off buying an internally regulated 280zx alternator. The alternator is a reman. unit from O'reilly that was on the old engine before without issue. Is there something else I could be missing here? I got a longer bolt/screw for the "E"/ground post of the alternator since the old one couldn't hold the wire and the capacitor at the same time. Is there some chance that the one I used isn't allowing the alternator to get a proper ground? I've also read things about how if the battery isn't charged enough the alternator won't charge, but I doubt that was the case since it seemed that the battery was at good voltage but gradually draining. I'm tempted to pull the trigger on a new internally regulated alternator and throw it in, but I would rather have someone point out what I can't seem to see is wrong before I spend the money on it. 2) The tachometer and oil/water gauge are not working. I know I have oil pressure as I verified that before starting the engine. The sending unit is new and I know it's getting oil. The stock tachometer coil signal wire is hooked up and I verified it at the resistor under the passenger side of the dash. Also verified continuity and resistance in the resistor. As far as I can tell, the gauges are getting the signal, they just aren't being powered. The lights do come on but after reviewing the wiring diagram those seem to be on a separate circuit anyway. According to another forum member, the 4th fuse down on the left side of the fuse panel provides voltage to the gauges. The fuse is fine and has continuity, though I don't get voltage on either side of the fuse. After checking where the fuse gets power from, it seems to be hooked into switched voltage from a black and white wire that is spliced in at multiple points throughout the car. Here's where it gets interesting, though. The fuse that provides power to the voltage/fuel gauge also appears to be fed by that wire, and I know my voltage/fuel gauge is working. I feel like I'm going crazy trying to track down the cause of the issue since every lead (no pun intended) I find ends up in me thinking that it should be working fine. Any advice is appreciated as always. Like I always say, HybridZ is the place I turn to when all my efforts seem to be getting me nowhere. - Pac Man

Car is no longer charging. Can anyone tell me what the role of the Black/Yellow wire is, going to the voltage regulator on a 260z? According to the factory wiring diagram it goes straight to the interlock relay. Is it supplying voltage TO the relay or is it receiving voltage FROM it? For context, here's the issue I'm having: I get 0v at the WB and Y connectors (these run to the F and N terminals on the alternator) There is 12v on the W wire at the regulator. The B wire is showing a strong ground. The BW wire runs inside the passenger compartment and becomes the green wires on the Tach, Amp/Fuel, and Temp/Oil gauges The BY wire connects to the interlock relay. Still trying to wrap my head around those last 2 bullet points. I have to admit, i don't understand why those any gauge besides the ammeter needs to be connected to the voltage regulator. Not sure if this is significant or not, but the BY wire reads .059 volts when the ignition switch is on. I am tempted to jump 12v to this wire, to see what happens, but i'm afraid of hurting the regulator, if it is isn't defective. Any advice is greatly appreciated!

Hi Z Forum, For the past couple days my battery hasn't been charging. I've replaced the alternator and belt. Before this was happening, to get it to charge I'd have to rev my engine to about 3000 RPM. The engine I have is a L24 with an E31 head. Any Ideas? Thanks.