I was watching my voltage on the digital display during a test drive on Saturday. My instrument panel voltage moved between 12 and 15, depending on RPMs. Having never watched it before, I'm not sure if that is normal or not. The instrument panel never lost power during that drive.

Can you guys share some additional context? I'm wondering if that harness is the reason I've already replaced one alternator (at 7k miles) and my instrument panel still occasionally loses power. I had the "charging system fault" message on the track before I replaced the alternator. The error...

Yes, I was able to clean it up fairly easily with a 1/2"-14 NPT tap. So for you future internet searchers out there, the rear diff drain (and fill) plug thread size is 1/2"-14 NPT.

@JAJ This was my first time draining the diff fluid in the GT350R, and the YouTube video I watched showed the diff fluid being drained by unscrewing the plug. I've never seen that type of clip before either. The plug is not difficult to unscrew, but the line connected to the plug makes it...

3/4"-14 NPT?

Does anyone know what size the drain plug is on a GT350 rear diff? I managed to damage the first couple of threads in the diff housing by cross-threading the plug after draining. I need to buy a tap to clean them up, but I'm not sure what size I need.