Hi,
The only way an external interference could affect your warning lights is if the external source was belting out a lot of power - especially considering your warning lights are hard-wired and earthed.
If this is indeed the case, where the tower (I'd assume that to be more of the culprit than HT wires) is pumping out quite a few watts of power in whatever waveband, and it is affecting your warning lgihts, then I'd dare say there'd be a lot more "lighting up" going on in your brain.
I strongly suggest that if you frequent this piece of road that you wear a hat made out of alfoil (or put a steel saucepan over your head) and connect it via a jumper cable to the chassis of your car. Perhaps also, as added security and to dissipate any excess energy from the tower, that you also place a light bulb in your mouth. It will glow when the radiated energy from the tower strikes you, but will quickly drain away by illuminating the bulb.
seeyuzz
river
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