On my Optimates, the yellow light is usually constant when charging, but flashes when it is going through a 'battery test' cycle. It then returns to a solid light.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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