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All 8 glowplug codes on startup and other misc issues
On startup lately I have been getting all 8 glowplug codes. The truck starts up just fine and there is no smoke, but all 8 codes show up and sometimes the battery light stays on and the voltage goes down to as low as 11.5 volts.
Today while driving the battery voltage dropped to 11.5 and wouldn't go back over 12 very much, it went up to 13 at point point but dropped back down shortly after.
Also, I've been hearing a weird squeak/grind from the rear end. All brakes are fine, recently replaced. When I jack the rear end up and put it in neutral and rotate the drive shaft or tires, it sounds like it is coming from inside the drive shaft. The sound only happens when starting from a stop for a short period, sometimes stopping, and idling in gear, both reverse and drive.
My other issue is with the front drivetrain. When I jacked the front up looking for issues, I noticed when I rotate the front left wheel, everything for the 4x4 system on the left side rotates, but when I rotate the right side only the wheel turns, none of the right side drivetrain. Is it supposed to do that, or is my 4x4 somehow engaged on that side or the hub locked?