no, not just the light connection... fuck the light

can you hear the motor if it's going in and out of VTEC? does the motor seem to "stutter" at all? if not, then it's something to do with the light. maybe the LED connection in the instrument panel. if it's a cheap LED setup, the LED may not be matched for automotive voltage, and could be burning up.

now if something tells you that VTEC operation truly is becoming dysfunctional, follow below.

check the VTEC solenoid wiring all the way back to the ecu with an ohm meter... wiggle the wires around and check for a possible intermittent connection.

if that's all good, then remove the VTEC solenoid and check the filter screen. if it's clean, replace the solenoid.

the solenoid and VTEC oil pressure are both monitored by the ECU... if something truly is wrong, you should have gotten a fault code. if you need a new solenoid, refer to my sig.