Hey guys, so both head and tail lights are flickering in my EK Civic and I haven't been able to figure out why.

What I've done so far is inspect fuses underneath steering column and under the hood. I've swapped the battery with a known working battery from another car but it still happens. This issue occurs even with the engine off so is it safe to assume that this is not an alternator issue?

I'll try cleaning the battery terminals and sanding the area where the grounds are connected to the chassis tomorrow during the day however on my brief inspection so far, all appears good.

Is there anything else I should look for that I have missed?

Thanks.