A LOT depends on WHICH ENGINE your 1999 Suzuki Grand Vitara is equipped with.Ignition timing is not adjustable on any engine except the 2.5L V-6.
To adjust the ignition timing on the 2.5L V-6, a scan tool must be used to turn off the computer timing control to check and adjust base ignition timing. Base ignition timing specification is 4-6 degrees BTDC.
SOURCE: Suzuki Vitara headlamp problem
Check your grounds for the dim light. The ground is not connected good or is dirty or starting to break. This is a problem with the ground circuit.
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