What is causing my headlights & tail lights to flash on/off?

2002 Honda Accord EX-V6 Coupe (6th Gen)

Background
Previous electrical issue of [STOP] fuse shorting out in the passenger side relay box under the hood, would replace with 20A fuse & correct issue

ABS & TCS display indicators are always on (Issue has been checked but couldn't get any answer to cause)

Other electrical functions work fine (cruise, sunroof/power windows etc)

Stock CD/radio & no aftermarket alarm

Right headlight will sometimes not turn on, but a gentle knock on headlight cover turns it on

Issue
Starting today after arriving at work, the headlights & brakelights continuously flash on/off with a clicking sound coming from relay box under the hood.

If flashers turned on, it's pattern is separate & distinct from my actual issue.

Car starts/runs fine - flashing only stops when I turn my lifts on driving.

Brake lights are out, when I replaced the fuse, it immediately shorted.

Will try to provide more information if needed, just trying to diagnose & find a solution to issue.

Thanks

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