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As you know LED's require little voltage to light up. A flicker tester could be made by adding a current limiting resistor to an LED. Then add two wires to it to use as probes. If it's then attached across two points in a circuit and there is momentary voltage drop the LED will blink...

Do you have any LED's and resistors laying around? I have an idea on how to make a tester to track down the problem. :cool: If you don't I can make one and mail it to you.

Instead of messing with messing with MT4 I'd suggest installing a jumper wire between the two top terminals of MT4. Be sure to disconnect the batteries first. The jumper will bypass MT4. See if the flickering stops. If it doesn't then it's not MT4.

MT4 is behind the gauge panel in the front right corner.

If the alternators regulator is failing the Charge meter should dance about during the flickering. Likely in the Negative range when the lamps are dim and in the Positive range when they brighten up. Too bad the charge meter wasn't in the video.

From the audio it sounded like he was toggling the panel lights on and off then.

Interesting.. The first thing I'd suspect is diode CR1. I've diagnosed a few sets where CR1 is failing causing 24 v problems. Inspect it and see if it looks cooked or cracked. Pull on it and see if it breaks in half. If that's the problem I'd suggest replacing it with two of the CR1's in...