On both the RFSV 110 and the civvie '87 110 & 120, the indicator light for glow is the light second from right on the lower row of indicators. The "choke" symbol is used on this light.
It only illuminates (showing current to heater plugs) when the start key is manually held between "on" and "start".
Is you motor car a LR with a factory fitted Isuzu? If it is a 6X6 I cannot tell you if it is the same.
Bookmarks