Hopefully someone can assist with my FD 1992 buzzer issue, I have read endless treads on this and followed them with some result in short-listing the issue to be an electrical issue????

I have grounded the coolant connection at the filler cap ..... along with checking the connection at the back of the power pump...... went for a spin which I though had solved the issue as buzzer didn't start until 5-10 min down the road.

I have double checked the above and still the buzzer is going off, the strange thing is that when I come to a stop or traffic lights it might stop and then back on once I take off to stay constantly buzzing while driving.....

Any ideas????
also does the buzzer wiring go to the ecu and then the alarm is fed to the buzzer & dash light within a separate wiring run?
is there any relays to be checked?

Thanks .... appreciate any assistance 👍

-Still on orginal build with 92k on the clock
-Recently had the speedo repaired / caps replaced but all was working after that. I.e no buzzer