[fv1620]

Richard greetings, I want to help but I'm having difficulty orientating myself to the lower picture, have you got a wider shot to show a bit more please? Bear in mind my GS has long since rotted away & having difficulty getting a feel to the problem.

Have I understood you correctly that you have a part marked FV228911 but it is not in the parts book or is it the hinged brackets that sit on FV228911?

I can't find FV228911 in the 1952 or 1960 editions nor in the copious amendments that were regularly issued for both. Although the 1952 edition is nothing like comprehensive & is not illustrated.

But I wonder whether the shortfall is that the trucks were originally designated CT & as economies were forced on the production certain unspecified features were done away with & they were then classed as GS.

Very early circuit diagrams show turn lights (of a type later used on the FV1609) as you know turn lights you see on Humbers are after service mods. So I wonder if the things you are having difficulty with are related to the CT to GS downgrade?