Take apart the signal assembly on the column and clean the contacts.
My replacement lights are ex-military on cords and with blackouts.
Open cooling works better because the stock rad has tubes that are too tiny and 95% are clogged by now. The bottle has too small of threads and the cap tends to pop off the bottle. When I first put in a '91 rad with a built in cap, I epoxied the lid on the bottle and stopped my rig from running so hot.