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Can't measure hot wires with an ohm meter unless they are disconnected
However, the "L" terminal of the alternator is powered from a fuse so if the fuse is blown, which is likely if the line is grounded. You're ok to measure it to ground.
In a 98/99, the wire is pink from the fuse panel to the gauges. This line then changes to brown from the gauge cluster to the "L" terminal of the alternator.
Check for your blown fuse. Mine is labeled "gauges". It's a 20AMP. Yours could be a 10 AMP.
You need to find where the "L" terminal wire on your vehicle goes and trace it back to see where it is grounded if it truly is grounded.
Start looking in places where it either turns a corner or where it passes through a piece of metal. You can also try removing the plug on the alternator and jump 12volts to the "L" terminal while the engine is running and see if you then get about 14volts across the battery.
Be sure the battery is charged before correcting the wiring problem so as to not pull too much from the alternator. They are designed to top off the battery not charge a deeply discharged one.
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